Do not highlight C-number sign in step21
Update Java number mode regexp, fixes #509
Fix go number regex, fixes #624
Merge pull request #644 from Sannis/update_numbers_regexps

Update numbers regexps
Noted titles and numbers improvements in CHANGES.md.
Correcting Mickaël Delahaye's name in AUTHORS.en.txt
Version 8.4
Updating version in package.json
Remove unused modules
Make tests for class cluttering consistent

* Remove the extra level of `describe`
* use should to begin test names
Add ids to namespace each test section
Remove long ids from build classname tests
Use the new namespaced test ids
Split up the long html string
Add spaces to keyword string for C++
Add inline diffs to tests

Since we compare html string and they tend to be difficult to compare, this
option makes debugging failed tests easier.
Merge branch 'test/cleaning-up'
Change [a-zA-Z0-9_] to simply \w
Move multiple \b to a single one at the beginning
Simplify the hljs class check in buildClassName