improve get query,make it enable to query by subproperty
add test script for subproperty query
Fix #191
added platform-specific null device as mongodb config file
removed commented options line
modified mongodb startup options with null device ternary option
Fixed error caused by incorrect main property in package.json
type-loader.json attempts to require all modules to find resources that might be included with the modules. This causes a problem when the main entry point for the package is incorrect
Merge pull request #218 from coderhaoxin/improve-query

improve get query,make it enable to query by subproperty
Merge pull request #240 from taras/master

Fixed error caused by incorrect main property in package.json
Merge pull request #223 from yoneal/issue-191

Fix #191 Fixed $field:1 for UserCollection
Merge pull request #232 from sespindola/master

set mongodb config file to null device