Minecraft Version support (#458)

* add support for other java/forge versions

* fix fetching correct mod for specified version.

* add support for other java/forge versions

* fix fetching correct mod for specified version.

* convert MinecraftClient.py to read forge versions from Randomizer Mod Repo.

* add minecraft_versions.json to gitignore.

* remove redundant json import

* update host to release.
add forge checking,
fixed duplicated code due to merge.

* clerify that beta channel will most likely make games no longer playable on release channel

* convert commetns to docstrings.

.gitignore

@@ -77,6 +77,7 @@ MANIFEST
 # Installer logs
 pip-log.txt
 pip-delete-this-directory.txt
+installer.log
 
 # Unit test / coverage reports
 htmlcov/
@@ -154,6 +155,7 @@ cython_debug/
 #minecraft server stuff
 jdk*/
 minecraft*/
+minecraft_versions.json
 
 #pyenv
 .python-version