Update CONTRIBUTING.md
Fix a typo
Create issue_template.md
Add template
Add ownCloud version
Remove :
Uneeded newline
Add a space behind the ####

Makes it at least better readable for me.
Add the correct link to the apps repository

:oops:
Add server operating system to template

Thanks @eMerzh, could be especially needed as there are some platform specific issues like filename encoding under MS Windows
Typos
Adding database to server config
Updated browser log
Merge pull request #1160 from owncloud/updateContrib

Update CONTRIBUTING.md