Update to v1.2.1

Changes:

Add colors to few more HTML report issues
Add uniquely MUTs to list of MUTs which will be used for testing
Reducing required keys needed from mbed-ls
Using getElementById for fetching elements in HTML report
Fix issue 181, when platform contains '-' when exporting to HTML        
Multi-target runs now copy to the correct device        
Handle case where tests aren't in each target run