Merge pull request #297 from aseemmittal/dirty

Formatting bills and adding reference in purchase order
Merge branch 'dirty' of https://github.com/GreatDevelopers/LibreHatti into dirty
Merge pull request #298 from aseemmittal/dirty

Formatting Bills
Merge branch 'dirty' of https://github.com/GreatDevelopers/LibreHatti into dirty
changes format of date in transport bill form.
Merge pull request #299 from jasvir99/dirty

changes format of date in transport bill form.
Merge branch 'dirty' of https://github.com/GreatDevelopers/LibreHatti into dirty