Update README.md
Copy slugignore and .git clearing implementation from slug-compiler.
Wrap conditionals in quotes.
Message for slugignore deletion.
Don't nest git-ls-files conditional.
Add -c flag to git ls-files.
Roll back slugignore changes here too.
Fix potential to nuke all the things.

Happened to me D:
Merge pull request #21 from md-5/patch-1

Fix potential to nuke all the things.
Apache ServerLimit, MaxClients increased.

Our app died the other day due to MaxClients being too small.  The
numbers have been raised to more appropriate levels.

The values chosen are more guesswork than anything else.  Feel free to
set them to a proper value if you understand what you're doing.