Added name to Interval

First step for #108

Added new `name` arg to `Interval` constructor, and will set `self.name` to that, if it is passed.

Still need to think about where in the repr this attribute goes, and it will need to be caught in various methods that call `Interval`, such as `Striplog._build_list_of_intervals`. There do not seem to be many, on a quick search.

scratch.py

@@ -0,0 +1,10 @@
+from striplog import Interval
+from striplog import Lexicon
+
+lexicon = Lexicon.default()
+
+text = "wet silty fine sand with tr clay" 
+
+interval = Interval._parse_description(text, lexicon=lexicon, max_component=3, abbreviations=True)
+
+print(interval)

striplog/interval.py

@@ -61,7 +61,8 @@ def __init__(self, top, base=None,
                  data=None,
                  components=None,
                  max_component=1,
-                 abbreviations=False):
+                 abbreviations=False,
+                 name=None):
 
         if not isinstance(top, Position):
             top = Position(middle=top)
@@ -70,6 +71,9 @@ def __init__(self, top, base=None,
             if not isinstance(base, Position):
                 base = Position(middle=base)
 
+        if name:
+            self.name = name
+
         self.top = top
         if base is not None:
             self.base = base
@@ -162,7 +166,7 @@ def _repr_html_(self):
         """
         Jupyter Notebook magic repr function.
         """
-        items = ['top', 'primary', 'summary', 'description', 'data', 'base']
+        items = ['name', 'top', 'primary', 'summary', 'description', 'data', 'base']
         rows = ''
         row = '<tr>{row1}<td><strong>{e}</strong></td><td>{v}</td></tr>'
         style = 'width:2em; background-color:#DDDDDD'