Basic support for code hinting in html files.

For HTML files, we replace the HTML sections with whitespace, leaving only the text of the script tags for Tern to see.
This way the offset/cursor positions don't need to be translated, which would be necessary to get jump-to-def to work.
Add tests for jscodehints in an html file.

Also fix some bugs with jump-to-def and function type hints uncovered by the tests.
Forgot to add new test file
refactor HTMLUtils.findStyleBlocks to find arbitrary blocks.

The js code hinting code needed to find script blocks, so refactor the style block code to find any kind of block, and call that instead of having another copy of the code.  findStyleBlocks now just calls the generic method, looking for "css" blocks.

Also fixed up the block finding code to handle empty blocks, which I ran into when looking for "javascript" blocks.
Merge branch 'master' into html-script-hinting
Fixup branch so it will merge cleanly again.

Conflicts:
	src/extensions/default/JavaScriptCodeHints/unittests.js
Merge branch 'master' into html-script-hinting
Code review cleanup - mostly in the unittests
update out of date comment
Merge pull request #3705 from eztierney/html-script-hinting

[JS Code Hints] Html script hinting