Added secion about project-specific settings to Readme.
Adds examples to `.dir-locals.el` README section.

Provies examples for customizing project compilation command string and
project test command string.

Fixes existing example code.

Adds documentation of using `.dir-locals.el` along with defcustom settings.
Add helm as development dependency.
Respect projectile-keymap-prefix when binding helm-projectile.
Merge pull request #402 from proofit404/master

Respect projectile-keymap-prefix when binding helm-projectile.
projectile-ag: vary prompt based on current-prefix-arg
Use a single mode line construct for projectile-mode-line

Multiple constructs break minor mode menus, see 
https://github.com/flycheck/flycheck/issues/365#issuecomment-51463686
Merge pull request #404 from lunaryorn/patch-1

Use a single mode line construct for projectile-mode-line
Merge pull request #403 from offby1/master

projectile-ag: vary prompt based on current-prefix-arg
Merge pull request #395 from joelmccracken/master

Adds examples to .dir-locals.el section in README
Fix a couple of failing tests
Quick fix for a failing test
Fix a broken test
Simplify test init
Fix noflet bindings indentation
Add a test for projectile-clear-known-projects
Replace redundant use of let*
Don't try to switch to a known project if there are no known projects
Extend the changelog a bit
Add a test for projectile-switch-project with no known projects