Improving find file performance by hacking in FindFileInProject.

[evanlong]

The change I made to FindFileInProject: use textmate.el's project root finder.
And picking between the find command and git ls-files if the active file happens
to be under git control.

The speed to first finding a file is significantly faster.

Here are the performance results that influenced my decision to list files under git control using git ls-files but avoid using hg manifest for mercurial (hardly scientific):

With the django project I had the following timing results for listing files:

time find . -path *.hg -prune -o -name *.git -prune -o -print 1>/dev/null
real 0m0.111s
user 0m0.046s
sys 0m0.062s

time git ls-files 1>/dev/null
real 0m0.014s
user 0m0.009s
sys 0m0.004s

time hg manifest 1>/dev/null
real 0m0.406s
user 0m0.146s
sys 0m0.055s

[evanlong]

Should also note I left ⌘+T intact now. You'll need to bind ffip to a key with something like this: (global-set-key (kbd "C-x f") 'ffip).

It makes it easy to compare and contrast the difference between the two for testing now.