change some function name for standardization

decrease query delay of combo product
building skeleton for sales crud module
oh, ViewModel driving me crazy..

still need to learn a lot before implementing ViewModel on
application... or else... you go nut in an instant
KeyMap - F1

Yay Congratz F1.. You are hereby dedicated for sales module.. prok prok
prok
finished adding `sales add` module

further debugging required
new module

- edit sales
- remove sales
- print sales

bug
- keymap conflict between add sales and edit sales

next
- search sales
new module: search sales

change
- paid on add sales and edit sales is selectOnFocus now
fix bug: keymap conflict
Merge pull request #3 from nicklaros/development

finished adding sales crud module