Simplified reading the configuration file.

Using 'source' (bash internals) to read variables. Five calls to sed are replaced by one.
Change config file format

Change ':' with '=', compatible with 'source' command.
Replaced when creating the file and when reading.
App type: Core

Updated strings from dropbox "Create App" page.
Merge pull request #54 from robertgc/master

Changes in configuration file management