Bit of Cleanup and few enhancements

[tsrivishnu]

• database.yml removed from git tracking.
• Specs added for vacancies controller index action.
• Vacancies can be sorted by ngo name feature added -- Enhancement #4
• Vacancies list can be filtered and sorted -- Enhancement #5
• Fixed - 'Post Vacancy' is getting an error when user not signed in -- Bug #6
• Hover/Click on map marker will show more info -- Enhancement #7
• Volunteers list can be filtered and sorted -- Enhancement #8
• Make a proposal button and form page added - Enhancement #9
• Terms and conditions validated during registration - Enhancement #10

[tsrivishnu]

@tamarakorr Please check and merge when you are free.

[tsrivishnu]

Filtering vacancies list will be now working!

[tsrivishnu]

Fixed - 'Post Vacancy' is getting an error when user not signed in -- Bug #6

Redirected user to signin page if not signed in when clicking the "post vacancy" button

[tsrivishnu]

Enhancement #7 added - Hover/Click on map marker will show more info

[tsrivishnu]

Filtering volunteers list will now be working!

[tsrivishnu]

Make a proposal button and form page added - Enhancement #9

[tsrivishnu]

Terms and conditions validated during registration - Enhancement #10