Merge tag '0.2' into develop

First release, 0.2. Pretty robust already.
Merge tag 'setup' into develop

First release had no setup.py
output of example
cool image :)
flake8 suggestions
svg to png
string.Template support put aside
put import inside if
jinja2 support
examples updated for jinja2
Merge branch 'feature/jinja2-support' into develop
json support
examples use json by default
Merge branch 'feature/json-data' into develop
-- stands for stdin for both --keys and --json
dont repeat yourself
examples for the use of stdin with --json
Merge branch 'feature/read-stdin' into develop
all ready for 0.3
Merge branch 'release/0.3'