Made pear-install-deps more dependable.

Had to work around inaccurate exist codes from `pear` proper by manually checking for installed packages and not attempting to install them again (which causes PEAR to return an error status‽).

Attempted the "proper" way to check for installed packages, but that doesn't work because the PEAR source code is super crusty. Resorted to scanning command line output using grep instead.
Added new executables to composer.json.
Added quotes to writedirs test.
Added note to clear-cache about new rm warnings.
Updated code-sniffer to check for the executable.
Updated all scripts to avoid stray output during $DIR init.
Fixed run-tests to pass args through properly.
More codesniffer updates.
Corrected readme typos.
Committing changes to start a new branch.
Merge pull request #7 from loadsys/pear-deps

Dependency management