Change meaning of @deprecated version and add a second machine-readable version.
Specify @deprecated versions as a range, delimited by a colon.
Revised @deprecated tag description using explicit 'starting version' and 'ending version' terminology.
Revised @deprecated to clarify that the stated 'ending version' is exclusive.
Merge pull request #50 from sun/psr5-deprecated

Change meaning of @deprecated version + add scheduled-for-removal version