Auto merge of servo#177 - servo:line-counting, r=emilio

Count line-numbers during tokenization

Before this PR, the `source_location` and `current_source_location` iterated (again) through input bytes separately from tokenization in order to count newline characters and determine the line number of some piece of a stylesheet.

This PR makes this counting happen during tokenization instead, where we already have a pass looking at every bytes.

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Auto merge of servo#176 - servo:bad_url_slice_not_at_char_boundary, r…

…=emilio

Fix another panic in bad-url token parsing

https://bugzilla.mozilla.org/show_bug.cgi?id=1383975

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Auto merge of servo#175 - servo:bad_url_slice_out_of_bounds, r=emilio

Fix a panic in bad-url token parsing. Fix servo#174.

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Auto merge of servo#171 - servo:token-cache, r=emilio

Add a one-token cache

This makes the `Servo_DeclarationBlock_SetPropertyById` micro-benchmark being added in https://bugzilla.mozilla.org/show_bug.cgi?id=1344131 faster by ~10%.

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Auto merge of servo#163 - servo:bump, r=SimonSapin

Unbump version

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0.16.0

Auto merge of servo#157 - upsuper:source-location, r=SimonSapin

Use u32 for SourceLocation

I suppose nothing is going to be happy if a CSS file can contain over 4G lines or columns...

All Servo rules have `SourceLocation` stored, so reducing its size is probably worth.

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Auto merge of servo#147 - nox:parse-hash, r=SimonSapin

Actually expose Color::parse_hash...

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Auto merge of servo#146 - nox:parse-hash, r=SimonSapin

Introduce Color::parse_hash

Useful to parse quirky colors.

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