Merge pull request #1 from mogetutu/feature/config-generator

Pesapal config generator
Update code with .md extension
Create CHANGELOG file
Move loading YAML config to initializer instead of each time the object is initialized
Update README
Correct date
Bump patch
Update CHANGELOG
Automate release date

- To reduce chances of forgetting to update it … I just keep forgetting
- Date default to GMT+3, Nairobi time ...
Make README a bit clearer in the initialization bit
Add new functionality: Query Payment Status
Add new functionality: Query Payment Details
Add functionality to change mode at runtime

- add `set_mode()` method to enable changing mode at runtime
- api_domain & api_endpoints are now private,  are now private, use
set_mode() to alter them
Fix syntax error and generator message
Add IPN listener
Bump to version 1.1.0
Update CHANGELOD
Update README to discourage direct email support
Make a provision for different currency billing using ISO codes
Update CHANGELOG