Small fix for Pred's regular expression.

The previous regex for Pred strings did not force a match to
the end of the string, so something with "_rel" in it would
cause a partial match (such as "free_relative_q_rel", which
matched only "free_rel").
Simplified the [incr tsdb()] module.

There is no longer an itsdb sub-package with a profile module,
but instead just a itsdb module under the delphin package. I also
decided against the idea of having an itsdb codec (and now I'm
questioning the benefits of codecs for any formats.. why not just
delphin.mrs.simplemrs?)
Initial commit of SimpleDmrs.

Also a few small fixes here and there. There is also ongoing
work on delphin/mrs/path.py, so it should be considered
broken in this commit.
SimpleMRS now allows surface strings.

This is a non-canonical extension to the format. The surface string
can also have a Lnk value, and they both appear before LTOP. So
semantically these are all the same, but the first two will get
their "surface" value assigned the value of the string.

[ "A dog barked."<0:17> LTOP: h0 INDEX: e2... ]
[ "A dog barked." LTOP: h0 INDEX: e2... ]
[ LTOP: h0 INDEX: e2... ]

Inner escaped quotes are fine, so you can have:

[ "Pat said, \"hi.\"" LTOP: h0 INDEX: e2... ]
Removed a debugging statement.
Merge branch 'SimpleDmrs' of https://github.com/goodmami/pydelphin into SimpleDmrs