Fix class merging

Fix attributes merge

closes #1358

see #1358

Test beginning slash slash

Allow self closing tags to contain white space

fix deprecated doctype 5

Fix deprecated `doctype 5`
http://cl.ly/image/1N3K3L0G3j0V

[closes #361]

We don’t actually support comments at arbitrary indentation. This
example only worked because it...

Update include:filter example code

Update document regarding include with filter

Ensure a newline after locals declaration in compiled client functions.

For the case where debug information follows.

Add pre tag fix to release notes

Use compile-client API from command line

Remove automatic tag wrapping for filters

Escape all elements inside pre tags

add case for source comments that break pre-1.0.0

This allows the use of a code tag inside a pre tag without introducing errant whitespace.

Attributes via new `&attributes` syntax

Support inline tags

Readme_zh-cn.md: Complete translation in `block prepend/apend`

Readme_zh-cn.md： complete translation of Include

Readme_zh_CN.md: markdown format

Readme_zh_CN.md: complete strings forgotten to translate

Readme_zh_CN: code block 'bash' -> 'sh'

In `block prepend/apend`, there are two paragraphs missing translation.

Some text in `Include` are not translated.
Missing translations added.

Remove trailing space.

`or` should be translated.

Ues `sh` instead of `bash` since these commands work in shells other than `bash` (`ksh`, `dash`,...

[closes #936]

Allow filter names to have hyphens in them

Throw an error if a self closing tag has content

closes #1301

closes #1303

Use strict, remove license comment from files, use multiple vars, use node.type not node.constru...

Removes the license from the top of each file and uses multiple var
statements.

Allow dynamic mixin names. usage: +#{'prefix_'+myVar}

Add a separate `compileClient` method and remove `client` option

Remove nasty polyfills

If people need to use this in old browsers, they must include polyfills
from now on.

[closes #1296][closes #1297]

Cleanup attributes

This does most of the work of `runtime.attrs` at compile time except
when attributes are being i...

Remove support for the `colons` option

It's been deprecated for ages

Remove !!!

Update the list of void elements

Closes #1262

Remove the assignment operator

The behaviour was never what anyone expected. What ever we made the
behaviour, it would confus...

Make filtering of include explicit

This adds the syntax:

```jade
include:filter-name path/to/file.ext
```

Remove support for parsed & conditional comments

Thanks to @ayoung

use local variable for storing debugging data