Support for ane packaging

Check the integration tests for more details.
The README should be probably updated too.

```
            <plugin>
                <executions>
                    <execution>
                        <goals>
                            <goal>package-ane</goal>
                        </goals>
                    </execution>
                </executions>
                <groupId>com.yelbota.plugins</groupId>
                <artifactId>adt-maven-plugin</artifactId>
                <version>@pom.version@</version>
                <configuration>
                    <pluginHome>../ph</pluginHome>
                    <extensionDescriptor>src/main/resources/extension.xml</extensionDescriptor>
                    <extensionSwc>src/main/resources/VolumeLib.swc</extensionSwc>
                    <sdkVersion>3.5</sdkVersion>
                    <platforms>
                        <platform>
                            <name>default</name>
                            <directory>src/main/resources/default</directory>
                        </platform>
                        <platform>
                            <name>iPhone-ARM</name>
                            <directory>src/main/resources/ios</directory>
                            <options>src/main/resources/platformoptions.xml</options>
                            <extractLibrarySwf>true</extractLibrarySwf>
                        </platform>
                        <platform>
                            <name>Android-ARM</name>
                            <directory>src/main/resources/android</directory>
                            <extractLibrarySwf>true</extractLibrarySwf>                        
                        </platform> 
                    </platforms>
                </configuration>
            </plugin>
```