clean up bean definitions

Includes:
* reorganizing dispatcher-servlet's bean definitions
* rename `org.n52.io.v1.data.TimeseriesMetadata` to `org.n52.io.v1.data.TimeseriesDataMetadata` ... **Will force SPI implementations to recompile**
* sets project version to `1.2.0-SNAPSHOT` due to above reason

Closes #62 indicatating that bean definitions should be reorganized. With this pull request the `dispatcher-servlet.xml` is deleted as timeseries-api serves as bridging component. No actual SPI implementation can be expected within this component, but within the component implementing the SPI.

For those projects the `timeseries-api_v1_beans.xml.template` shall give a quick start on which beans are expected as SPI implementation. The beans declared are injected into the Web binding controllers via ` `timeseries-api_v1_Web.xml`.

A clean and separated configuration is now possible via `dispatcher-servlet.xml`:
```XML
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
    <mvc:annotation-driven />
    <import resource="timeseries-api_v0.xml"/>
    <import resource="timeseries-api_v1_web.xml"/>
    <import resource="timeseries-api_v1_beans.xml"/>
</beans>
```