Added sample Apple iOS definitions based on the Apple iOS 7 DISA STIG.
Updates to example Apple iOS system characteristics.
Merge pull request #122 from mpeck12/master

Added Apple iOS sample definitions, minor modifications to Apple iOS example system characteristics.
Updates to Android schemas:
Assorted grammatical corrections.
Removed items with dependencies on undocumented APIs.
Consolidated device_access_item (and equivalent definitions) into password_item.
Updated namespace to comply with OVAL Sandbox convention.
Improved documentation for Android schema password policy items.
Updated Android proof-of-concept application to account for Android
schema changes (mainly removed items that depend on undocumented APIs
and changed namespace to conform with OVAL Sandbox convention).
New Android proof-of-concept application binary to account for changes to application.
Edited Android test definitions to account for Android schema changes.
Fix bug in writing certificate hex strings
Fix bugs in Android test definitions
Modified sample Android definitions based on Android schema changes.
Added sample OVAL system characteristics file.
Fixed getHex hex string generation again in Android proof of concept application.
Corrected Android screen_lock_timeout to indicate that value of 0 means no
restriction.
Added example OVAL definitions based on Android Knox STIG.
Corrections to proof of concept Android Knox STIG definitions
Merge pull request #123 from mpeck12/master

Updates to Android schemas and supporting materials
fixed a few schematron rules.
fixed a few schematron rules.
fixed a few schematron rules.