update SetEngine for postgresql #76
Merge pull request #77 from compressed/postgres

update SetEngine for postgresql #76
change gravatar image to match URL scheme
Merge pull request #78 from compressed/master

change gravatar image to match URL scheme
Merge branch 'master' of github.com:gogits/gogs into dev
Rename the posgresql to postgres, add the Dockerfile for postgres image.
Build the database image by the variable DB_TYPE, but not mysql.
Add the line to replace the database type.
Replace the 'mysql' options with 'db' options, makeing the config according to the database type.
zip archive download
download link
Replace the 'mysql' options with 'db' options in build.sh
Add the apt source when installing potgres.
Replace the host with $DB_PORT, which is dependent to the database imagae's exposed port.
Merge remote-tracking branch 'origin/master'
Add the support of postgres as the database.
(Config the db in the build.sh file, make the DB_TYPE to 'postgres').
Update docs
Add view by tag support
Update README.md

Add the instruction of installing gogs with PostgreSQL
Mirror bug fix on downloading zip
swap \n for \000, update len check, when reading receive-pack input
Remove the installation of PostgreSQL, which not needed actually.
Merge pull request #79 from compressed/null_handling

swap \n for \000, update len check, when reading receive-pack input