Add configuration. See #5 #8.

What's new:
- --config flag to pass a INI config file to parse. See config.ini.
- Updated the modules scripts for configuration. Now needs to unset
  variables passed by CLI or config.
- Fix release directory that was added in love file (maybe).
- Properly escapes sed arguments.
- chmod +x to getopt.sh and read_ini.sh
- Fix #12

config.ini

@@ -0,0 +1,63 @@
+; love-release config file
+
+; Default values will be used if the option is left blank.
+; To prevent a build from being executed, comment its section name and options.
+
+[global]
+; Directory where the zip archives will be stored
+release_dir="releases"
+
+; Love version to use
+love_version="0.9.1"
+
+; Project's name
+project_name=""
+
+[windows]
+; Path to an .ico file to use
+icon=""
+
+[macosx]
+; Set the maintainer's name. Provide it for CFBundleIdentifier.
+; No spaces and no special characters except underscore. Better be lowercase.
+maintainer_name=""
+
+; Path to an .icns file to use
+icon=""
+
+[debian]
+; Version of the package
+package_version=""
+
+; Maintainer name (full name)
+maintainer_name=""
+
+; Maintainer_email
+maintainer_email=""
+
+; Homepage
+homepage=""
+
+; Description
+description=""
+
+; Package name
+; No spaces and no special characters except underscore. Better be lowercase.
+package_name=""
+
+[android]
+; Android game activity
+; No spaces and no special characters except underscore. Better be lowercase.
+activity=""
+
+; Package version
+package_version=""
+
+; Maintainer name
+; No spaces and no special characters except underscore. Better be lowercase.
+maintainer_name=""
+
+; Package name
+; No spaces and no special characters except underscore. Better be lowercase.
+package_name=""
+