Bug 514634 General improvement

[Upgrade] Adding Intro plug-in
[Upgrade] Adding CheatSheet
[Fix] Remove unused dependencies on PDE plug-in 
Amend - 8
[Upgrade] Adding Thermostat tutorial plug-in

Change-Id: I546dc56b7a6f5d751f51f2c17636e7e229aab8e2
Signed-off-by: Boutheina Bannour <boutheina.bannour@gmail.com>