Added the possibility to escape "{{" braces by appending a vertical bar "{{|"
Merge branch 'escape-curly-braces' of github.com:matteodem/meteor into matteodem-escape-curly-braces
Allow {{| in attributes, add tests

Unfortunately, these escapes don’t enjoy full “optimization” because template tags are expanded after optimization.  To remedy this, we’d have to be more flexible about what TemplateTags can parse into (e.g. a string), or add another pass to the compiler.
Merge branch 'matteodem-escape-curly-braces' into devel

Conflicts:
	History.md