Fix issues with progress bar functions
Fix issues with progress bar functions

+ Simpler method for finding CSV size
+ That number 100 was definitely a typo
+ Fix some mismatched variable names in progress_bar

codeforamerica/somerville-teacher-tool,erose/studentinsights,jhilde/studentinsights,jamestyack/somerville-teacher-tool,studentinsights/studentinsights,codeforamerica/somerville-teacher-tool,codeforamerica/somerville-teacher-tool,studentinsights/studentinsights,hunterowens/somerville-teacher-tool,hunterowens/somerville-teacher-tool,studentinsights/studentinsights,jamestyack/somerville-teacher-tool,erose/studentinsights,jhilde/studentinsights,jamestyack/somerville-teacher-tool,erose/studentinsights,erose/studentinsights,studentinsights/studentinsights,codeforamerica/somerville-teacher-tool,hunterowens/somerville-teacher-tool,jhilde/studentinsights,jhilde/studentinsights