Merge pull request #36 from thbourlove/master

Show completions for built-in  functions, keywords, constants when in namespaces without explicitly prefixing the base with \
Add tests for #36
Fix #37

Previous regexp matched the word "class" inside an another word like:
"SomeClass".
Fix GetClassLocation() for abstract/final classes in the current buffer
Opps, forgot to stage last edit for c8973ad5
fix col_number