ARODataCollector apk for x86 devices

The goal of this pull request is to be able to build a version of the ARODataCollector apk for x86 devices. This is needed in order to automate battery profiling on x86 vm's.

There are a number of changes in this pull request:

```
$ git hist master..tuenti-master
* 71fb2de 2013-11-04 | TOOLS-1024 Add README.tuenti.md with build instructions for the DataCollector app (rafatower/tuenti-master, origin/tuenti-master, tuenti-master) [rtorre]
* b8d8f86 2013-10-31 | TOOLS-1024 Add the local.properties file and the artifacts produced by the build to .gitignore [rtorre]
* a4547e7 2013-10-31 | TOOLS-1024 Add project files needed to compile tcpdump for both arm and x86 [rtorre]
* 3fceb1f 2013-10-31 | TOOLS-1024 Add some ant project files needed to build [rtorre]
* 367c7a4 2013-10-30 | TOOLS-1024 uncomment wrongly commented out code in tcpdump [rtorre]
* 9856d73 2013-10-30 | TOOLS-1024 Make ARO see bluetooth as disconnected if it is not implemented (as in android sdk emulator) [rtorre]
* 14c38bd 2013-10-30 | TOOLS-1024 Make ARO see not implemented network interfaces as disconnected [rtorre]
```

Please bear in mind that some files added are android project files generated automatically but that should be committed to the source repo as stated in android docs, instead of regenerated as part of the build instructions.

There are more fixes to be sent, but these ones had already been tested and gone through peer review so I think they are ready for the public.

Once everything is ready I'll cherry-pick the non-tuenti specific changes (none in this pull request) and send a pull request to the upstream project.

Thanks!