Merge pull request #27 from sindresorhus/streaming

convert to streams and handle phantom ourselves
Lock phantomjs to the last version that worked with fontface

Thanks @JakeChampion :)
fix stream error handling
fix tests
Fetch up to date fallback resolutions

Fixes #4.
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Merge pull request #46 from IonicaBizau/patch-1

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Close GH-51: Fix special characters creating invalid file name.
Merge pull request #24 from kevva/fetch

Fetch up to date fallback resolutions
followup to #24
don't lowercase url - fixes #50
minor tweaks
add stub for options
clarify where screenshots are saved - fixes #36
support `localhost` as url - fixes #31
default to white background

so we don't get transparent when user doesn't set any
don't use HTML4 prop

thanks @ZDroid
bump deps
bump deps
add options to customize format and path