wiped out all LLVM 3.1 support
reversed macros LLVM_3_6 to LLVM_3_5+ in .cpp and .h files
updated Makefile for reverce LLVM_3_6 flag
fixed broken Makefile (failed to build 3.5)
removed LLVM 3.1 option from python scripts
Merge branch 'master' of https://github.com/ncos/ispc into remove-support-for-old-llvm
remover LLVM 3_1 from cbackend.cpp
Merge pull request #831 from ncos/remove-support-for-old-llvm

Remove support for llvm 3.1
changed 3.5 repo path from tag to branch until rc2 is out
tail the run_tests.log (100 lines)
Merge pull request #832 from ncos/ispc-mail-tail

tail the run_tests.log (100 lines)
removed leading slash in a comment
Merge pull request #833 from ncos/ispc_build_fails

Changed LLVM 3.5 repository path to http://llvm.org/svn/llvm-project/llvm/branches/release_35
add separate test fail count for each LLVM revision
made text look more beautiful
Merge branch 'master' of https://github.com/ncos/ispc into log_beautifier
Merge pull request #834 from ncos/log_beautifier

Make test fail counters count fails for each LLVM revision separately.
removed some dead code
merge with master
added fail counters to the top of the message body