Add documentation and fix regex in alphabetize

The regex in alphabetize did not contain an end-of-word requirement
at the end. This would have caused 'zyx1' to have been sorted to
'zxy1'. Instead, such combinations are left alone now; a test is
added to ensure this.
Test for the presence of filter selectors
Adds Tests to MANIFEST, adds MANIFEST.SKIP
More Documentation

Also removes the TODO labeling from t/boilerplate.t, since it is
no longer "to do".
Bugfix: MANIFEST.SKIP needs regular expressions.
Fixed MANIFEST.SKIP, removed obsolete ignore.txt

Now the manifest test passes, which was the last one outstanding.
Add missing documentation

Missing documentation (i.e. perldoc) is added to the Text::Lossy
module.
Consolidate READMEs into Markdown version

Since Markdown is meant to be perfectly readably plain text, it makes
sense to keep only a Markdown version (github dialect). Plain text
consumers can read it just as easily.
Fix MANIFEST and boilerplate test, add TODO

The consolidation of the READMEs requires changes in the MANIFEST
and the boilerplate test.

Add a TODO file to keep track of (internal) change requests.