Merge pull request #383 from thomasf/master

Make less calls to file-truename.
Demote errors to messages when trying to load a TAGS file.
Merge pull request #381 from jasonm23/ignore-ctags-load-error

Ignore errors when loading a tags file.
Call error if the tags command failed.

Fixes https://github.com/bbatsov/projectile/issues/377
Merge pull request #379 from Wilfred/master

Call user-error if the tags command failed.
Use `defadvice' rather than the new `nadvice` interface which is only
available in trunk. This fixes f71b5f7.

* projectile.el (projectile-compilation-find-file): Convert to `defavice'.
                (projectile-mode): Use ad-(de)activate.
Merge pull request #386 from daimrod/fix-compilation-find-file

Use `defadvice' rather than the new `nadvice` interface
Added secion about project-specific settings to Readme.
Mention how to add an alternative key prefix for all Projectile commands
Fixed a bug where if you delete a directory that used to exist, it could not find-file-in-known-projects
Merge pull request #388 from triclops200/master

Fixed a bug where if you delete a directory that used to exist, it could...
Fix keymap sorting
Reshuffle keybindings a bit

* Use a common prefix (`s`) for all search commands (`ack`, `ag` and
  `grep`)
* Remap switching to project to `C-c p p` (easier to press)
* Remap testing project to `C-c p P` (perhaps this needs a better keybinding)
Update README.md

The default keybinding for `projectile-switch-project` is C-p p p, not C-p p s
Merge pull request #390 from jfager/patch-1

Update README.md
Make projectile-persp-switch-project work from lisp

If not called interactively, takes an argument of the project's directory
Merge pull request #391 from alanpearce/persp-switch-from-lisp

Make projectile-persp-switch-project work from lisp
Make projectile-mode-line customizable

Do not explicitly set projectile-mode-line, but instead use a standard
mode line format and splice the project name into it with :eval.

Allows users to completely customize the appearance of the Projectile
Mode line.
Merge pull request #394 from lunaryorn/customizable-mode-line

Make projectile-mode-line completely customizable
Suppress a couple of compilation warnings