import tax rate generator from invoicing generator gem
add ledger item and line item migrations
move active record generators under invoicing namespace
move generators into corresponding folders
wip: understanding how to write generator specs
add top level specs for invoicing generators
move generators under rails folder as per AR conventions
force rails 3.2 gemspec to use minitest 4.7.5
remove view generator, its lot of work, separate issue
Merge pull request #31 from code-mancers/6-invoicing-generators

6 invoicing generators