Merge pull request #7 from julian-upc/master

Actualitzar
Merge pull request #2 from julian-upc/master

actualize
Merge pull request #1 from julian-upc/master

actualize
Codes update
finally added sheet1. Sorry
Merge pull request #84 from cassandradecock/master

Codes decrypted
incorporated some solutions
Merge remote-tracking branch 'origin/master'
Merge pull request #86 from lafaillette/master

finally added sheet1. Sorry for the inconvenience
Sheet1: gpg file not corrupted I hope... Really Sorry
Merge pull request #88 from lafaillette/master

Sheet1: gpg file not corrupted I hope... Really Sorry
Sheet1 encrypted
Merge pull request #90 from claramateo/master

Sheet1 encrypted
updated sheet 1/2
Sheet2 unencrypted source code
Merge pull request #92 from ideparada/master

Sheet2 unencrypted source code
sheet2_upload

still not finished
New version of Sheet2

Errors corrected, finished 2nd exercise
Merge pull request #94 from elisabetburjons/master

New version Sheet2
Merge pull request #93 from jan-fiser/master

Jan_Fiser_sheet2