Add arguments to restlog command

* Modify server name, port and log dir through arguments
Modularize resources

* HelloWorld in new module
* Add status and version module
* Move package version to separate file
Add 404 errorhandler

Flask returns 404 with html page by default. Add error handler to return
error in json format.
Add basic tests

Added tests for:
* HelloWorld module
* Status module
* Version module
Add log listing to rest api

* List files with modified and size metadata.
* Only show files modified the past week
Add end-point to get log file

* Validation to make sure file is in correct directory
* Only files that been modified past week are accessible
Add rest api curl examples to README