Enhancement Block Storage: Get Block

- Add basic framework to get a block through the Block Storage functionality
Enhancement Block Storage: Get Block

- Refactor: Added functions to be able to build the various URL paths, removing referenced variables accordingly
- Refactor: Moved the Get Block Length from the Vault Model to the Block Model
- Added Test for getting a block through the Block Storage End-Point
Merge branch 'master' into enhancement_block_storage_controller_get_object

Conflicts:
	deuce/model/block.py
Update

- PR #132 was merged so we now have access to the Ref-Modified functionality; enabling
Merge branch 'enhancement_block_storage_controller' into enhancement_block_storage_controller_get_object
Bug Fix

- Added missing docstring
Merge branch 'enhancement_block_storage_controller' into enhancement_block_storage_controller_get_object

Conflicts:
	deuce/model/block.py
	deuce/model/vault.py
	deuce/tests/test_blocks.py
	deuce/tests/test_blockstorage.py
	deuce/transport/wsgi/v1_0/blockstorage.py
Merge branch 'enhancement_block_storage_controller' into enhancement_block_storage_controller_get_object
Bug Fix: Sqlite Driver Get Ref Modified

- SQLite driver did not return properly when ref modified did not exist for the entry
Bug Fix: Get the metadata id not the storage id from metadata
Merge pull request #166 from BenjamenMeyer/enhancement_block_storage_controller_get_object

Block Storage: Get Block