Add more documentation

- Add installation.rst
- Finish server.rst
- Details need more discussions
- Need more proofreading
Change README file

- Change README file
Add simplejson in Installation

- Add simplejson in installation
Change location REST resource definition

- Change location REST resource definition
- Data to be changed
Change data POST JSON object and location GET JSON object

- Change data POST JSON object
- Change location GET JSON object
Add Data Schema

- Add Data Schema
- Fix REST resources examples
Add Estimated Semantic Location event

- Add Estimated Semantic Location event
- Remove redundant schema documents
- Change version number to 0.3 from 0.2
Update GET Candidate Resource

- Update GET candidate resource
- Change Android library interface section name
Remove Redundant Introduction

- Remove redundant introduction
Simplify some words in install

- Simplify some words in install
Merge REEST interface and data schema in branch 'feature-doc' into develop