Remove duplicate "v" snippet
Refactor variable snippets
* "v" is for shorthand variable declaration
* "vr" is for variable initialization
* "var" is for longhand variable declaration
* "vars" is for multiple variable declarations
Merge pull request #291 from simeonwillbanks/rename-go-variable-snippets

Rename go variable snippets
Rename 'exp' snippet to more common snippet.

The old 'exp' with a block expectation becomes 'expb'.
Rename trigger for expectation of error from 'raise' to 'experr'
Merge branch 'master' of https://github.com/honza/vim-snippets