Implementing automatic building

Using MsBuild wizardry magic, the Attributes.dll, T4TS.tt and
T4TS.tt.settings.t4 are now built automatically!
Remove obsolete references from Attributes project
Rename T4TS.Example.sln to T4TS.sln
Ignore packages/ folder
Merge pull request #31 from cskeppstedt/builder

Automatated build of T4TS.tt etc