preparation for next release (wip)

removed author and version info from source files.
edited readme text in preparation for next release (work in progress).
preparation for next release (wip)

added PiwikTracker.php file for ease of install.
updated readme in preparation for next release.
preparation for next release (wip)

edited readme text in preparation for the next release.
updated admin language file

corrected a spelling mistake
added more details to the help text
readme edits for v0.3 release

minor additional changes in the readme file in preparation for v0.3
release