Create some util functions.

GAE supports only one dimensional list, create functions to support
multi-dimensional by casting list to string and reverse.
Fix a bug

Check if there is incorrect open bracket.
fix a bug, and add package init
Create map_element class and unit tests
fix format
Merge remote-tracking branch 'origin/dev' into map_dev_2
Merge remote-tracking branch 'origin/dev' into map_dev
Create map_data, ma_data_node and unit tests
Merge pull request #7 from stevenh47/map_dev

Create some util functions.
Merge pull request #10 from stevenh47/stevenh47_map_data_node

Create map_data, ma_data_node and unit tests
Merge pull request #6 from stevenh47/map_dev_2

Create map_element class and unit tests
Merge pull request #11 from stevenh47/map_dev
Fix bug and added unit tests
Merge pull request #14 from stevenh47/stevenh47_map

Fix bug and added unit tests