Add a function to upload spreadsheet for transgenes

[valearna]

Duplicate the behavior already in place for alleles and strains

[valearna]

this is now ready to test @draciti @vanaukenk

[draciti]

Need to revise the instructions for authors on how to fill out the spreadsheet. @draciti @valearna @vanaukenk
Also for #347 and #348

[vanaukenk]

Here is the master sheet for transgenes: https://docs.google.com/spreadsheets/d/1z_HoZk5bX_qm-aRLk_ZeNBofl7cH8jMEN38uKCkiqco/edit?gid=0#gid=0