Add library models to menu, as well as saved new files
Merge pull request #617 from NetLogo/recent-files-submenu

Add library models to menu, as well as saved new files
Update matrix operator docs
Merge pull request #615 from NetLogo/matrix-docs

Update matrix docs
Update models for 5.1
Update for 5.1-RC1
Add minor version compatibility for 5.x line
fix failing test
pick up trivial matrix extension change
Fix #47!  Add doubled modal popup for weird OSX issue
Fix #619!  version should have three decimal places
Merge pull request #622 from NetLogo/3dmenu-fix

Fix #47!  Add doubled modal popup for weird OSX issue
Small fixes to nw extension
Fix #620!  Remove extraneous stuff from extensions!
Fix #175!  Add plist entry for retina displays
Merge commit for 5.1.0-RC1 into modelruns

Conflicts:
	headless/resources/system/version.txt
Merge branch '5.x' (5.1.0-RC2) into modelruns

Conflicts:
	bin/release.sh
	headless/resources/system/version.txt