Make find logic faster and smarter

* Use arguments to find instead of grep.
  * it's faster and more appropriate.

* Use dynamic case sensitivity like vim search does.
  * lowercase == insensitive, MixedCase = sensitive

* Prepend and append a glob '*' to the search string
  * searching for "blah" is effectively "*blah*".

* Match on filename ONLY unless the search string contains / or *
  then match on whole path.

* Escape those shell arguments!!

* Only match and show files (not dirs)

* Filter out the whole .git directory
* Filter out vim *.sw? files
Merge pull request #5 from danielbeardsley/find-logic-smarterize

Make find logic faster and smarter