[PPP-3272] - Update all current "infocenter" references to "mind touch"

- Updated link references from infocenter.pentaho.com to help.pentaho.com.
- Tweaked references to InfoCenter to be consistently spelled (casing)
   InfoCenter is how the Doc team wants to refer to the help documentation at this point. No reference to MindTouch since it is only the implementation vehicle.
Merge pull request #571 from webdetails/master

[PDI-12370] Spoon on ubuntu 14.04 unity wasn't showing the toolbar
Merge pull request #572 from webdetails/master

[PDI-12370] Comment for the unity integration
Merge pull request #570 from rfellows/dev

[PPP-3272] - Update all current "infocenter" references to "mind touch"
PDI-5269 : Large XLS/XLSX files causing Excel Input to throw OutOfMemory
(OOM) exceptions
PDI-5269 : merge into head of patch for gdocs step
Merge pull request #574 from mattcasters/PDI-5269

PDI-5269 : Large XLS/XLSX files  throw OutOfMemory : FIX for broken gdocs step
PDI-5269 : merge into head of patch for gdocs step/missing include
Merge pull request #575 from mattcasters/PDI-5269

PDI-5269 : merge into head of patch for gdocs step/missing include
PDI-11948 - Error in sub-transformation If "KETTLE_DEFAULT_SERVLET_ENCODING" in set to UTF-8.

Fixed steps:
1) Mapping
2) Trans Executor
3) Simple Mapping
4) Single Threader
Provided JUnits also covered all steps and setServletReponse method of Trans objects.
Merge pull request #564 from  YuryBY/PDI-11948