expand tabs in documents
Add ‘ifndef … endif’ guard around thread locking macros

With the define guard the macros can be set via compiler options (‘-D’ or ‘-include’) instead of having to maintain a locally edited version of the ‘reginit.h’ file.
Merge pull request #23 from textmate/master

Add ‘ifndef … endif’ guard around thread locking macros
fix typo in doc/RE.ja (Close #28)
import Oniguruma 5.9.5
Merge tag 'Oniguruma-5.9.5' (Issue #30)

Merge the original version of Oniguruma 5.9.5.

Conflicts:
	configure
	configure.in
	oniguruma.h
	regcomp.c
	regparse.c
	st.h
Merge remote-tracking branch 'origin/master' into tmp/ruby-2.0.x

Conflicts:
	regint.h