Setting an attribute to null (and only null) removes that attribute

This addresses #68
Merge pull request #73 from bantic/null-value-removes-attribute

Setting an attribute to null (and only null) removes that attribute
Isolate a bug in IE's cloneNode
Test td creation inside tr with no parents
In IE, walk cloned fragments and add missing text nodes
Merge pull request #74 from mixonic/ie-siblings

IE 11, 10, redux
Fix parent state leaking between compile calls
Use copy-dereference instead of deprecated copyRecursivelySync
Merge pull request #76 from joliss/copy-dereference

Use copy-dereference instead of deprecated copyRecursivelySync
Fix text node repairing
Update loader.js
SVG support
Build node modules of htmlbars, build AMD with dependencies
Add QUnit test runner to node, htmlbars package
Pass context and morph to ambiguous mustaches
Merge pull request #78 from mmun/morph-ambiguous

Pass context and morph to ambiguous mustaches
Merge pull request #77 from tildeio/build-node

Build CommonJS versions of packages, add Node test runner
Merge pull request #75 from mixonic/svg-v4

SVG support
Ensure Morph constructor can be inlined in v8 (by reducing upfront AST)
single assignment per var statement