Some work on https://github.com/radare/radare2/issues/298

 - Changed the x86* tests to run with all available
   disassembly engine
 - Initial tests for ARM
   - only 32bit so far
   - needs more tests for branching instructions
Test refactoring part 1 of X
More tests cleanup
Merged master fixed conflict.
moved arm test according to new test structure
Merge branch 'r2_issue_298'