Fixed position of 'vimshell#cd()' call
- Fixed #120 cd problem.
Merge pull request #120 from ichizok/fix-bufname

Undesirable buffer name
- Added path check.
Improve initialization.
Add helper functions
Improve utility functions
Improve helper functions.
Improve helper functions
Version up
Fix errors
Fix errors
Fix errors
Improve check output behavior
Fix paste prompt behavior
Fix g:vimshell_editor_command error
Fix documentation tag
Fix execute commands
Deleted previous coloring routine
Fix #123 move mappings