translate SnapshotSpan into current Snapshot in ResolveUnopenedNamespaceTagger
Merge pull request #589 from vasily-kirichenko/fix-resolve-unopened-ns-bug

translate SnapshotSpan into current Snapshot in ResolveUnopenedNamespace...
Create a rename suggestion list

  - spell checking
  - thesaurus
Convert suggestion sequence to naive observable
Make the suggestions an observable
Add plural and singular forms to the suggestions
Suggest parts of the Identifier
Fix casing for type and variable
Trying to bundle Hunspell in the VSIX
Very basic UI for rename suggestions - not working yet
Very basic UI for rename suggestions - working
Remove unused variable in suggestions
Only suggest plural for correct words
Updated UI for rename

Now populates list asynchronously as suggestions come back