Fix issue #121
Fix possible null pointer dereferences
Use memcpy instead of strcpy in yr_strdup cause memcpy is probably faster
Fix issue #122
Release version 2.1.0
Increase MAX_STRING_MATCHES
Fix issue with test cases in Python 3
Fix issue with ^ anchor in regular expressions used with "matches" operator. Make yr_re_exec easier to read.
Fix bug in yr_re_exec logic
Fix warning about uninitialized variable
Updated to Yara 2.1.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Makefile.am
	README.md
	config.h
	configure.ac
	doc/YARA User's Manual.pdf
	libyara/Makefile.am
	yara-python/setup.py
	yara-python/setupwin32.py
	yara-python/setupwin64.py
	yara-python/tests.py