[BUGFIX] Avoid json_encode warning about INF

When removing all profiles, a warning on INF not conforming to the JSON
spec is emitted, leading to an exception:

json_encode(): double INF does not conform to the JSON spec, encoded as
0 in …/Sandstorm_Plumber_Controller_OverviewController_Original.php line
111

This change replaces the INF with PHP_INT_MAX.
[BUGFIX] Remove leading slash in route uriPattern
[TASK] Update documentation

Updates the installation instructions to match current requirements.

Some minor tweaks as well.
[TASK] Cleanup to docblocks, code and configuration

Renamed some variables, fixed some FLOW3 uses, added/tweaked docblocks,
cleaned up YAML files, some UI tweaks.
[FEATURE] Make standalone

This change makes the PhpProfiler independent of Plumber, so it can be
used with having to install Plumber as well.

This is useful if you want to separate the UI for viewing profiling
results from the actual data collection.
Merge remote-tracking branch 'sandstorm/master' into standalone
[TASK] Make profile path configurable and add error checking
[BUGFIX] Setting for profile path requires trailing slash
[TASK] Update documentation and composer manifest
Merge pull request #10 from kdambekalns/standalone

Standalone plus other fixes
Merge remote-tracking branch 'sandstorm/master' into documentation
Merge pull request #11 from kdambekalns/documentation

Update documentation and composer manifest