for(number) docs fix

Documented {{scope.index}} correctly.

for(integer)

PR: #709

This enables for loops to loop through numbers:

{{# for(this.count) }}
  {{ scope.index }}
{{/ for }}

Fix docs typo

fix typo for deprecated is helper to recommend eq helper as replacement

Named Partials render string result in stringOnly state

This fixes named partials to render string of DocumentFragment in stringOnly state, for example:

var view = stache( 
    '{{<addressView}}.someClass { color: #000; }{{/addressView}}' +
    '<style>{{addressView()}}</style>'
);

var fragment = view();
console.log(fragment.firstChild.innerHTML); // <style>.someClass { color: #000; }</style>

#715

Allows `.` (dot) in for-of key

This fixes an issue where the key in a for-of loop contains a dot, for example, if the data looks like this:

"Page.2" : {
pageName: "Page.2"
}
can-stache could not read/render item.pageName where item is the object above. Now the dot or dots are escaped which allows the value to be read and rendered.

#698

QUNIT2 upgrade

This updates the tests to use QUnit@2.x.x.

#690

Warn when closing magic tag is missed

Throws a warning when a magic closing tag is missed, for example:
{{# let foo="bar"}} {{foo}} will warn with "missmatch.stache:1: closing tag {{/let}} was expected".

#692

Add documentation for data helper

Resolves issue #574

Added a deprecation notice for the {{ data helper }}

@function can-stache.helpers.data {{data name}}
@parent can-stache/deprecated

@deprecated {4.3.0} Use [can-stache.helpers.domData] instead.

@signature `{{data name[ key]}}`

Adds the current [can.stache.context context] to the
element's [can.data].

Handle nested call functions

Allows use of returning functions from functions

Resolves - #587

stache("{{ foo(1)(2) }}")

Simplifies whitespace control and adds an option and add links in deprecated docs

#492
#670