add aliases

cc @jonahkagan not tested...not sure the best way to test it.
Could duplicate all existing tests and run them under aliases, but that
seems like overkill.

README.md

@@ -129,6 +129,8 @@ _s.each(readable, console.log);
 // 6
 ```
 
+*aliases*: `forEach`
+
 ---
 #### <a name="map">map</a> `_s.map(readable, iterator)`
 
@@ -146,6 +148,8 @@ mapped.on("data", console.log);
 // 6
 ```
 
+*aliases*: `collect`
+
 ---
 #### <a name="reduce">reduce</a> `_s.reduce(readable, options)`
 
@@ -192,6 +196,8 @@ reduced.on('data', console.log);
 // { a: 3, b: [ 2 ] }
 ```
 
+*aliases*: `inject`, `foldl`
+
 ---
 #### <a name="filter">filter</a> `_s.filter(readable, iterator)`
 
@@ -210,6 +216,8 @@ filtered.on('data', console.log);
 // 4
 ```
 
+*aliases*: `select`
+
 ---
 #### <a name="where">where</a> `_s.where(readable, attrs)`
 
@@ -284,6 +292,8 @@ first.on('data', console.log);
 // 3
 ```
 
+*aliases*: `head`, `take`
+
 ---
 #### <a name="rest">rest</a> `_s.rest(readable[, n])`
 
@@ -298,6 +308,8 @@ rest.on('data', console.log);
 // 5
 ```
 
+*aliases*: `tail`, `drop`
+
 ---
 #### <a name="flatten">flatten</a> `_s.flatten(readable[, shallow])`
 
@@ -334,6 +346,8 @@ uniq.on('data', console.log);
 // 1
 ```
 
+*aliases*: `unique`
+
 ---
 #### <a name="chain">chain</a> `_s.chain(obj)`
 

lib/mixins/each.coffee

@@ -18,6 +18,8 @@ class Each extends Transform
       @push chunk
       cb()
 
+fn = (readable, options, stream_opts={objectMode:readable._readableState.objectMode}) ->
+  readable.pipe(new Each options, stream_opts)
 module.exports =
-  each: (readable, options, stream_opts={objectMode:readable._readableState.objectMode}) ->
-    readable.pipe(new Each options, stream_opts)
+  each: fn
+  forEach: fn

lib/mixins/filter.coffee

@@ -17,6 +17,9 @@ module.exports = class Filter extends Transform
       @push chunk if @options.fn chunk
       cb()
 
+fn = (readable, options, stream_opts={objectMode:readable._readableState.objectMode}) ->
+  readable.pipe(new Filter options, stream_opts)
+
 module.exports =
-  filter: (readable, options, stream_opts={objectMode:readable._readableState.objectMode}) ->
-    readable.pipe(new Filter options, stream_opts)
+  filter: fn
+  select: fn

lib/mixins/first.coffee

@@ -11,6 +11,10 @@ module.exports = class First extends Transform
       return
     cb null, chunk
 
+fn = (readable, options, stream_opts={objectMode:readable._readableState.objectMode}) ->
+  readable.pipe(new First options, stream_opts)
+
 module.exports =
-  first: (readable, options, stream_opts={objectMode:readable._readableState.objectMode}) ->
-    readable.pipe(new First options, stream_opts)
+  first: fn
+  head: fn
+  take: fn

lib/mixins/map.coffee

@@ -18,6 +18,9 @@ class Map extends Transform
       @push @options.fn(chunk)
       cb()
 
+fn = (readable, options, stream_opts={objectMode:readable._readableState.objectMode}) ->
+  readable.pipe(new Map options, stream_opts)
+
 module.exports =
-  map: (readable, options, stream_opts={objectMode:readable._readableState.objectMode}) ->
-    readable.pipe(new Map options, stream_opts)
+  map: fn
+  collect: fn

lib/mixins/reduce.coffee

@@ -25,6 +25,10 @@ class Reduce extends Transform
       @_val = @options.fn @_val, chunk
     cb()
 
+fn = (readable, options, stream_opts={objectMode:readable._readableState.objectMode}) ->
+  readable.pipe(new Reduce options, stream_opts)
+
 module.exports =
-  reduce: (readable, options, stream_opts={objectMode:readable._readableState.objectMode}) ->
-    readable.pipe(new Reduce options, stream_opts)
+  reduce: fn
+  inject: fn
+  foldl: fn

lib/mixins/rest.coffee

@@ -9,6 +9,10 @@ class Rest extends Transform
     return cb() if @seen < @rest
     cb null, chunk
 
+fn = (readable, options, stream_opts={objectMode:readable._readableState.objectMode}) ->
+  readable.pipe(new Rest options, stream_opts)
+
 module.exports =
-  rest: (readable, options, stream_opts={objectMode:readable._readableState.objectMode}) ->
-    readable.pipe(new Rest options, stream_opts)
+  rest: fn
+  tail: fn
+  drop: fn

lib/mixins/uniq.coffee

@@ -32,6 +32,9 @@ class Uniq
     hash_fn ?= String
     return new (if sorted then SortedUniq else UnsortedUniq) hash_fn, stream_opts
 
+fn = (readable, sorted, hash_fn, stream_opts={objectMode:readable._readableState.objectMode}) ->
+  readable.pipe(new Uniq sorted, hash_fn, stream_opts)
+
 module.exports =
-  uniq: (readable, sorted, hash_fn, stream_opts={objectMode:readable._readableState.objectMode}) ->
-    readable.pipe(new Uniq sorted, hash_fn, stream_opts)
+  uniq: fn
+  unique: fn