Fix broken link in readme.

The link was going to a 404 (https://github.com/AutoMapper/AutoMapper/blob/develop/AutoMapper/AutoMapper/wiki/Getting-started). Replaced with a fully qualified URL.
Adding WP8 unit tests
Merge pull request #306 from alexandermlharris/develop

Fix broken link in readme.
Attempt at removing conditional compilation statements. More to come.
Collection factory default good
Removing more conditional compilation
Reader writer lock moved to core
Core automapper now can stand alone
Changing package to include PCL versions
I hate git line ending garbage
Reverting a bunch of insanity