developer docs - apipie commands
developer docs - normalizers
output definition moved to abstract command
developer docs - output definition updated
Merge pull request #49 from tstrachota/docs

Second part of developer docs
Bump to 0.0.9
Fixed test - clamp API changed in 0.6.2
Merge pull request #50 from mbacovsky/clamp_api_change

Clamp api change
docs structured into separate pages
Merge pull request #51 from tstrachota/docs

docs structured into separate pages