Remove some dead code.
Rename make_url/current_url to parse_url/base_url, to align with spec terminology.
Implement document.createProcessingInstruction

Spec:
http://dom.spec.whatwg.org/#dom-document-createprocessinginstruction

This is a sub-task for #1428.
auto merge of #1622 : brunoabinader/servo/document-createprocessinginstruction, r=Ms2ger

PR #1620 adds ProcessingInstruction DOM interface.

Spec:
http://dom.spec.whatwg.org/#dom-document-createprocessinginstruction

This is a sub-task for #1428.
Provide AbstractDocument::from_node(node: AbstractNode)

TSIA.
auto merge of #1634 : brunoabinader/servo/document-fromnode, r=jdm

TSIA.

@jdm mentioned to use ```AbstractDocument::from_box``` internally, though.
add case of merge inline info & modify ref test
auto merge of #1577 : ksh8281/servo/inline_add2, r=larsbergstrom

there is a issue when TextRunScanning.
this is for 
```
<span style="background:red;font-size:35px;border: black solid 15px">
        <span style="background:purple; 20px solid">
            <img src="test.jpeg" style="border:blue 30px solid;" />
        </span>
</span>
```
this case. left border of "img" is missing
auto merge of #1608 : SimonSapin/servo/url, r=metajack

Align with spec terminology.
Build libstd etc. with debug info when Servo configured with --enable-debug
Remove some string literal heap allocations
Change the mechanism behind summit-crash.html
Move FailureMsg contents into a cloneable struct
Add a helper for sending a message on task failure
wip
more wip