Misc iron-router 1.0.0 fixes, and make it a weak dep

Merge branch 'master' of github.com:gadicohen/meteor-messageformat

Conflicts:
	lib/mfPkg/messageformat-client.js
	package.js
	versions.json

iron:[email protected]

Compat with iron:[email protected]

v0.0.42 security fix

v0.0.42 security fix (deny functions) Fixes #63

v0.0.40; 0.9.1 compatibility

constraint fix