Creates Invoice Settings Controller with views#53

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Bartuz wants to merge 5 commits intospree-contrib:2-1-stablefrom

Bartuz:2-1-stable

Commits on Jun 4, 2014

Open-URI support for prawn
Bartuz
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Moves invoice settings to its own section
Bartuz
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Moves footer tothe bottom of pdf
Bartuz
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Binding.pry removed
Bartuz
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Commits on Jun 5, 2014

Columns width are now based on column_widths variable
Bartuz
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