Bump version to 0.4.9

Bump version to 0.4.8

Bump version to 0.4.7

Bump version to 0.4.6

Bump version to 0.4.5

Restore versions in the build plugins

These versions numbers were removed in 236b20e and caused an error
during publication:

    $ meteor publish
    => Errors while publishing:

    While publishing the package:
    error: You must specify a version constraint for package blaze
    error: You must specify a version constraint for package underscore
    error: You must specify a version constraint for package htmljs
    error: You must specify a version constraint for package minifiers
    error: You must specify a version constraint for package spacebars-compiler

Note that the dependency version that will actually get includes will
be higher that the one we specified thanks to the Meteor constraints
solver.

Bump version to 0.4.3

Bump version to 0.4.2

Fix #104

Document the new `.tpl.jade` extension