Bugfixing and Refactoring parse.py

[hayesall]

This pull request re-factors the makeIdentifiers() function in parse.py and fixes a few fairly critical errors.

• makeIdentifiers is now imported by default when rnlp is imported.
• Fixed a critical error in parse.makeIdentifiers() where the lateWordInSentence predicate was never created. In its place a second (and erroneous) lateSentenceInBlock predicate was created instead.
• The way punctuation was previously handled did not quite work correctly. text_string.strip(_punctuation) worked in most simple cases, but certain punctuation marks within sentences were problematic for BoostSRL's parser.

[codecov-io]

Codecov Report

Merging #7 into master will increase coverage by 43.12%. The diff coverage is 94.2%.

@@             Coverage Diff             @@
##           master       #7       +/-   ##
===========================================
+ Coverage   55.14%   98.26%   +43.12%     
===========================================
  Files           5        7        +2     
  Lines         214      231       +17     
===========================================
+ Hits          118      227      +109     
+ Misses         96        4       -92

Impacted Files	Coverage Δ
rnlp/tests/rnlptests/test_textprocessing.py	100% <100%> (ø)	:arrow_up:
rnlp/textprocessing.py	100% <100%> (ø)	:arrow_up:
rnlp/tests/rnlptests/test_parse.py	100% <100%> (ø)
rnlp/tests/rnlptests/test_converter.py	100% <100%> (ø)
rnlp/__init__.py	100% <100%> (+18.75%)	:arrow_up:
rnlp/parse.py	96.19% <90.24%> (+79.97%)	:arrow_up:

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