Fix issue where trivia is incorrectly identified as an identifier following a dot.

Fixes #753
Escaping of '<' characters in Word to Markdown conversions
Prevent non-TypeScript (HTML/JSON/...) files from being added to test suite.
Merge pull request #757 from Microsoft/escapesInMarkdown

Escaping of '<' characters in Word to Markdown conversions
Merge pull request #758 from RReverser/master

Prevent non-TypeScript files from being added to tests.
Limited identifying identifiers after dots to keywords.
Adjust sig help implementation to match the new simpler sig help API.
Merge pull request #760 from Microsoft/sigHelpRefactor

Adjust sig help implementation to match the new simpler sig help API.
Add jake task for generating Markdown language spec
Merge branch 'master' into specJakeTask
Adding word2md.js to .gitignore file
Merge pull request #762 from Microsoft/specJakeTask

Add jake task for generating Markdown language spec
Merge pull request #755 from Microsoft/misidentifiedIdentifier

Fix issue where comments are incorrectly identified as identifiers
Export tsc as public node api
Improve api to require("typescript") from node.