[fr] add po file for french language
replaces queries on PHP_OS by stripos

stripos is case insensitive.
strstr in IncludePanel.php seems to make no sense since it doesn't use the return value of strstr
strpos in DebugTimerTest.php probably works in most cases but as noted on the Stack Overflow article http://stackoverflow.com/questions/738823/possible-values-for-php-os it can also return "Windows".

Fixes issue mentioned by Mark at https://github.com/cakephp/debug_kit/pull/78/files#r4691995
Rename DebugKitLogListener to DebugKitLog.

This name change makes it compatible with the changes in 2.4 to unify
logging adapter conventions.

Fixes #128
Use parent call.
Update help on Benchmark shell.

Use newer API's for printing and formatting help.
Reformat code and remove redundant comment.
Clean up some comments and code style things.
Add missing newline.
Transparent icon when toolbar is minimized
added arugment parsing for BenchmarkShell, containing fix of help call
Using constant for include path separator
Clarify README docs.

Fixes #129
current doesn't always return first item in array, reset does
Removing console.error when history panel is disabled