allow options to take array values, useful for  --replace
add test case for complex opts
Added check for wkhtmltopdf exit status
Adding missing quote
Update README.md
link to current pdfkit github page
wrong url
Stricter escaping of strings, bump version to 0.5.3
Merge pull request #163 from gdi2290/patch-1

Update URL for wkhtmltopdf installation instructions
Merge pull request #162 from matthewrudy/patch-1

Update link to pdfkit github page in gemspec
Merge pull request #160 from dfens/patch-1

Fix typo in README
Merge pull request #159 from GRoguelon/patch-1

Add missing quote to README
Merge pull request #154 from swieton/master

Check wkhtmltopdf exit status for success instead of just checking output
Merge pull request #122 from elarex/master

Allow multi-valued options (Array, Hash)
Update History.md
Merge pull request #1 from pdfkit/master

updates