Issue 59 new ask post connection fail

[pkillian]

Changes in SubmitLoader.java resolve issue #59:

• SubmitLoader.validateResponse was not correctly responding to HTTPS, only to HTTP
• Avoid NullPointerExceptions in SubmitActivity.java by checking if variables are null before casting toString()
• Various code format fixes in LoginActivity.java and SubmitActivity.java make code more readable (tabs were pushing code off editor's viewport