Changes

[RelEng] Prepare target platform for final release
Change-Id: I8fd05c70012d71d8fc55812ab4476a4e82736aa5

Bug 536589: Add support of new uriScheme extension point
This adds an uri scheme handler for the custom uri scheme
"eclipse-mpc".
Marketplace client currently get's URLs in the form 
http://marketplace.eclipse.org/marketplace-client-intro?mpc_install=311881
"eclipse-mpc"-URLs are exactly the same only the "http" is exchanged 
with "eclipse.-mpc". The idea is that the marketplace website renders 
links with the "eclipse-mpc" URI scheme.
The implementation is quite easy. It just replaces the "eclipse-mpc" 
back to "https" and just calls the existing facilities in the 
MarketplaceUrlHandler class.
Change-Id: I6934c35e0188288ffa6962bf0d6f62e369e9a05c Signed-off-by:
Matthias Becker <ma.becker@sap.com>

Bumped version to 1.8

Bug 536589: Add support of new uriScheme extension point
Refactored URI handling for both d&d and uriScheme handler.
- changed custom uriScheme to eclipse+mpc
- d&d also supports the custom scheme now
- cleaned up and refactored uri handling