Change before/after annotations

Following up on the merge by @draculus - this makes it consistent so it
behaves like @depends annotations.  More than one @before/@after can be
used by adding additional @before/@after lines to docblock comments.
Fix documentation formatting

Fixing formatting (tabs inserted instead of spaces)
grabTextFrom doesn't work with regex

A change to the match() function returns an empty crawler rather than
null.  Added a test for regex with grabTextFrom
Update .travis.yml
added redirect_header_interval template into tests, fixes broken builds
Merge pull request #1519 from zbateson/grabTextFrom-with-regex

grabTextFrom doesn't work with regex
Merge pull request #1517 from zbateson/before-after-annotations-mod

Change before/after annotations
Adding remote code coverage requests context configuration feature