basic update method support
not settable attr exception
new method
update
rename notsettable to readonly
basic save method support
conflict error exception
text change
update method fixes
test fixes
save method fixes
wiki page update method support
Merge branch 'master' of https://github.com/maxtepkeev/python-redmine

Conflicts:
	docs/changelog.rst
Merge branch 'master' of https://github.com/maxtepkeev/python-redmine
major docs update
basic project update method support