Add receiving email and tests for it
Merge pull request #12 from TeamWhat/email

Receiving email
Add version to subjects
Fix cucumber
Merge pull request #13 from TeamWhat/version

Add version to subjects
Version updates are registered on backend
Merge pull request #14 from TeamWhat/version

Version updates are registered on backend
Remove irrelevant data from xls and csv
Refactor to_csv to module
Refactor receiver
Merge pull request #15 from TeamWhat/refactoring

Refactoring
Started final visualizations
Fix average file age bars
Add visualizations for gender, age, country, file size and age
Change column charts into bar charts
Added total number of each file type
Add OS version pie chart
Fix conflicts