Adapt to 1.0

*  The HTML parser is more strict: every tag needs to be properly close etcetera
*  {{ isolate }} tags are no longer necessary
*  Template functions are now in the `Blaze` namespace and have changed signatures
*  Using Template.templateName.someHelperFunction to create a function accessible in a template
   is deprecated. Put the functions in a dictionary and call
   Template.templateName.helpers({ someHelperFunction: ... });