Add contexts for string mode hash values

Allows for evaluating hash parameters such as ../city in string mode.
Merge pull request #454 from leshill/fix_string_mode_contexts

Add contexts for string mode hash values
If building AMD modules, and only one template is being compiled,
return the compiled template from the AMD module
If building AMD module and compiling multiple templates, return the full
templates (or partials) hash from the AMD module
Added a component.json file for Twitter's Bower package manager.

See [https://github.com/twitter/bower#defining-a-package](Defining a
package) for more information about how the file was generated.
Merge pull request #488 from tnwinc/amd-module-return-values

Amd module return values
Change download link in install instructions

The install instructions in the readme were still pointing to the GitHub downloads page, which is deprecated and out of date.

Updated to point to the official site, which has a big download button.
Merge pull request #492 from iangreenleaf/patch-1

Change download link in install instructions
paragraph width
Changed component.json to bower.json per Bower 0.9.0 update.
Merge pull request #499 from gilesbowkett/paragraph_width

adjusted paragraph width for readability
Adjust formatting of bullet list
Added link to a gist for loading handlebars templates (sync and async) in README.
Create handlebars.js.nuspec for inclusion in NuGet

Added a .nuspec file for those people who use Visual Studio and NuGet and might want to use handlebars.js deployed from NuGet in their application.
Explicitly only include the handlebars.js from the dist folder
added local pointer to handlerbars.utils to allow this to browserify properly for IE
Merge pull request #513 from tommydudebreaux/master

Using handlebars with browserify causes IE to throw - TypeError: Invalid calling object
Add release notes

Fixes #471
Merge pull request #489 from DevinClark/bower-update

Added a component.json file for Twitter's Bower package manager.
Fix links in release notes