Simplify plugin id

Replace groupId/artifactId with single id.
Remove affix from sidebar

Just in case number of sidebar items is taller than screen.
Change terminology, drop adhoc from adhoc pointcut
Use JAX-RS-ish annotations for url mappings
Stuck traces are not visible
Display correct number of spans
Improve enter key behavior on forms
Auto focus on first form element
Update third party dependencies
Convert back to LESS

Fits workflow better, no need to use sass-bootstrap, no Ruby required
for building.
PhantomJSDriver
Build on travis-ci
Rename informant submodule to core

This should help avoid confusion when referring to the 'informant'
folder (e.g. see README.md).
Switch back to Firefox for WebDriver tests

Seeing sporadic failures when using PhantomJS driver, see
ghostdriver issue #140.
Update to use new shaded artifact name
Travis-ci upload informant.jar to fixed location

And update README.md link to point to this fixed location.
Display commit hash for SNAPSHOT versions
Do not use underscore prefix on non-private field

Angular is logging info message about this:

'Referencing private fields in Angular expressions is disallowed!'
Clean up Firefox warning
Use filtered MANIFEST.MF for more control

Mostly to remove the chaotic ordering of manifest attributes.