Version 1.0.0

Meet the all-new PEG based parser

Thanks to all contributors! Special thanks to @little-bobby-tables

Breaking Changes

Mixing inline and nested children is no longer supported:
```
p Inline
 span Nested
```
This will now produce Inline span Nested instead of InlineNested. This is the expected behavior in ruby-slim.
Embedded engine developers should handle dynamic code blocks in render/2. First argument of engine's render method is now a list of binaries and dynamic parts in the form of {:eex, binary}
IE conditional comments are no longer supported #127
Possible symbols for tag shortcuts is now limited to this: ., #, @, $, %, ^, &, +, ! plus any valid tag name

Improved support for code in attributes, for example:
```
script src=static_path(@conn, "/js/zepto.min.js")
```
is handled now #115
Support for multiple inline-tags in one line #122
Improved support for interpolation in text blocks. It is now possible to use helpers like Phoenix.HTML.raw/1 inside #{} interpolation to avoid escaping by eex engine #130
Added support for leading and trailing whitespaces in elixir output #120
Multiline comments #126
Support new config options: default_tag, sort_attrs