Ensure vim uses compatible shell

If you're using fish or some other shell, this will keep the install from failing.
Merge pull request #257 from johntyree/tabularize_ampersand

Add Tabularize shortcut for &.
Merge pull request #256 from johntyree/invhlsearch

Use invhlsearch instead of nohlsearch
Merge pull request #232 from beyondwords/3.0

Ensure vim uses compatible shell in bootstrap
Merge remote-tracking branch 'upstream/3.0' into 3.0