Address PHP CodeSniffer errors and warnings

Address PHP CodeSniffer errors and warnings

One class of errors left unaddressed: Class name "WebInstaller_Language"
is not in camel caps format. I think this can be changed, too, but I
wasn't able to quickly find out where class names are being created.

Change-Id: I920b0231db1b70b68c6c8907257c288a0e112668