Resolve "Create pattern matching function"

Closes #33

See merge request !32

Resolve "Add unit tests for clean_html.R"

Closes #32

See merge request !34

Resolve "Enhancing Rasa (Documentation)"

Closes #34

See merge request !36

# Conflicts:
#   processing/wikiproc/R/utils.R

Fix get_birthdate

See merge request !33

Resolve "Add unit tests for cleanHtml.R"

Closes #32

See merge request !27

Merge branch '32-add-unit-tests-for-cleanhtml-r' of git.informatik.uni-leipzig.de:text-mining-chatbot/wiki-rasa into 32-add-unit-tests-for-cleanhtml-r

* Fixed a few function calls
* Deleted unneeded r script
* Deleted unneeded function declarations
* Some cleanup

Merge branch '32-add-unit-tests-for-cleanhtml-r' of git.informatik.uni-leipzig.de:text-mining-chatbot/wiki-rasa into 32-add-unit-tests-for-cleanhtml-r

Merge branch '32-add-unit-tests-for-cleanhtml-r' of https://git.informatik.uni-leipzig.de/text-mining-chatbot/wiki-rasa into 32-add-unit-tests-for-cleanhtml-r

* Added roxygen comments
* Moved nlp init into package
* Fixed various bugs
* Added import_packages.R and replaced all other imports with explicit ones
* Converted my methods to snake case
* Some minor stuff

* resolve paths from project root
* modify DESCRIPTION

* Create R package containing function definitions
* Create directory processing containing scripts
* fix some typos
* general cleanup

Merge branch '32-add-unit-tests-for-cleanhtml-r' of git.informatik.uni-leipzig.de:text-mining-chatbot/wiki-rasa into 32-add-unit-tests-for-cleanhtml-r