Added Ctrl-A and Ctrl-M commands
Fix WordUnderCursor and add tests
Make WordUnderCursor work for single character words
Generally improved WordUnderCursor & fixed panic with whitespace
Added tests for Cursor.RuneAfter & fixed end of line error
Fixed WordUnderCursor panic when on last word in a line
Test byte width returned from RuneAfter is correct
Don't clobber the last search term if attempting to search for whitespace
Merge pull request #32 from gchp/master

Added Ctrl-A and Ctrl-M commands
Fixed Cursor.EndWord skipping last word on a line
Fix Cursor.PrevWord return value
Refactor Cursor.NextRuneFunc to be more efficient