fixed init special chars

[Andrew-Lees11]

Fix for issue #437.
The init option was no handling hyphen in project name correctly. The generator was using the yoman name for the init option which replaces all special characters with spaces. This is different from our generator which replaces special characters with dashes.

I have moved the generate project name above the init spec so that the name is generated and then used for the init. I have also made the init function create a new directory if the name is changed.

These changes with make the init function act the same as accepting all default parameters when going through yo swiftserver.

I have also added some extra special characters to be replaced with dashes for the name function and corrected the comments.

A test for this fix has added and all npm tests are passing.

[codecov-io]

Codecov Report

Merging #445 into develop will increase coverage by <.01%.
The diff coverage is 95.83%.

@@             Coverage Diff             @@
##           develop     #445      +/-   ##
===========================================
+ Coverage    90.93%   90.94%   +<.01%     
===========================================
  Files            9        9              
  Lines         1335     1336       +1     
===========================================
+ Hits          1214     1215       +1     
  Misses         121      121

Impacted Files	Coverage Δ
app/index.js	91.15% <100%> (+0.02%)	⬆️
lib/helpers.js	94.33% <75%> (ø)	⬆️

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