Update link to issues page
Add page to redirect donate.html
Add new features page
Add 'Why SymPy' to the main page
Add redirect for features.html
Merge branch 'master' into newissue-fix
Update link to issues for nl translation
Merge pull request #1 from skirpichev/newissue-fix

Newissue fix: nl translation added
Merge pull request #70 from asmeurer/newissues

Update link to issues page
Merge branch 'master' into features

Conflicts:
	templates/index.html
Regenerate pages with new features page
Update static files submodule
Merge pull request #74 from lidavidm/features

Features page
Update the submodule
Update development.html
Merge pull request #75 from debugger22/update_dev

Update development.html
Update physic notebook links to correct 404
Merge pull request #78 from willingc/physics_ex_404_fix

Update physics notebook links to correct 404 - Issue 77
Update static files
Change submodule to use HTTPS URL