First pass at tcsh support, hook is wrong
I think I may have a working version of tcsh support. Much
more testing is required, but have successfully run a tsch
shell using the hook and it appears to work.
Adapt `direnv exec` to also work on non-env folders.

This allows to unload the current environment.

Eg:

    alias tmux='direnv exec / tmux'
Having test script mostly working stuck on special vars
tcsh support passing all tests but special vars
Added tcsh to docs and minor grammatical correction
Fix typo
Fix some typos
Merge pull request #147 from vially/typos

Fix some typos
Merge pull request #146 from bbense/tcsh-support

Tcsh support