Add the scirpts for auto deploy.
Add the auto build scripts for deplying gogs with Docker.
Fix the path problem, which will build the mysql image as the gogits image
Update README.md

Update the guide of how to deploy gogs in docker with the scripts.
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.
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').
Remove the installation of PostgreSQL, which not needed actually.
Add two apt source:aliyun and nchc, make a '#sourcename#' before the RUN command to make the apt source configurable in build.sh
Allow the user to config the apt source in build.sh
Change the MySQL password placeholder to THE_DB_PASSWORD.
Add the memcache(d) Dockerfile
Add the redis Dockerfile
Checkout to the latest dev branch when building the gogs docker image.
Add the MEM db config replacement script in the deploy.sh.
Change the image naming, start with "gogits/"
Update the githu.com/Unknwon/com module before getting gogs.