v2.12 rollup bugfix release

• Fixes to AutoGemm with beta == 0 and removing trtri hard coded options (@pavanky,@shehzan10)
• test-functional passes all tests
• Fixes to compile with clang 3.7 (@iotamudelta)
• Fixes to dtrsm (@shehzan10)
• gcc compiler flags refactored for non-x86 machines (@psyhtest)
• Travis and Appveyor fixes (@haaHh)
• Added TLS memory and removed global cl_kernel objects to fix threading issues
• improvements to the unit tests to increase reliability comparing floating point values
• Add opencl device selection logic for test correctness programs
• Removed the -pedantic flag from gcc builds to reduce the amount of warnings
• Support for altivec on powerpc64 P8 systems (@tfauck)
• Fixes to syr2 (@mgates3)