Init sphinx document files
Add document auto build script, adjust the doc file structure
Updated getting started document
Update subscription document
Update subscription document
Add requirements for building document
Fix #13, write a tutorial
Add API reference document page
Add the awesome balanced logo in layout template
Update structure and TODOs for API page
Try to fix readthedocs doesn't respect our custom template issue
Update company API document
Update plan API document
Update plan listing API document
Update customer API document
Update subscription API document
Update transaction API document
Merge pull request #56 from victorlin/documents

Merge documents branch, fix #13