[#690] WIP - Fetching a data file authenticated connection

* Try to minimize the number of changes in current code (e.g.
  TaskServlet), by encapsulating the signature calculation in a
  `S3Util` class.
* More changes to the new utility class are comming (e.g. get|put
  methods)
[#690] WIP - Implement PUT request using REST api

* The MD5 calculation is not working properly and the endpoint is
  rejecting the request.
* The final implementation *must* include the MD5 checksum as integrity
  validation
[#690] Fix MD5 generation

* Avoid hexadecomal temporary conversion
* Trim whitespace after Base64 computation
* Add MD5 to the signature payload and to the http request
[#690] Merge branch 'develop' into issue/690
[#690] Implements survey publication using S3Util.put
[#690] Merge branch 'develop' into issue/690
[#690] Implements Query String based authentication

* `getBrowserLink` generates a URL containing the necessary parameters
  for a _query string_ based authentication
* Useful for generating links to be shared, e.g. Link to bootstrap files
  via email
[#690] Implements bootstrap functionality using S3Util

* Refactor bootstrap functionality using S3Util
* The generated link gets the _Query String_ authentication params
[#690] WIP - Implement report upload using S3Util
[#690] Merge branch 'develop' into issue/690
[#690] WIP - Delete UploadUtil and update references

* The UploadUtil class is not longer needed
* Update references to that class, e.g. `SurveyBulkUploader`
[#690] WIP - Remove unused constants
[#690] Create new Config folder

* Moved `ide` to `Config`
[#690] WIP - Introduce the new instanceConfigurator

* A new project is now in place that takes care of creating the
  necessary files for a new instance
[#690] Fix typo in `apiKey` property
[#690] Adds documentation on how to build the instanceConfigurator.jar
[#690] Implements appengine-web.xml file generation, plus fixes
[#690] Simplify gaeId parameter
[#690] Include version in generated .jar file
[#690] Update instanceConfigurator documentation