SDK: add couple of fields

Added decimals and scroll fields to panels.

SDK: add SetRawDashboard

New method allows import raw JSONs that was previously exported by GetRawDashboard().

License change to Apache 2.0

No other changes except the comments in the file headers. I decided to change the license of the project from GNU GPL 3 to Apache 2.0 because:

1. it will simplify code exchange with other repos of Grafana project, the most of them use Apache license
2. the parts of the code used in a proprietary software of my employer.

So Apache license will better suite my needs. Currently I am only author of autograf and the project has no other contributors. The code of v0.1 and earlier commits can be used and forked under GNU GPL v3.

Just a milestone

Client part works. It tested with Grafana 3.x. No DSL yet.