calculate frequencies and display on page

I need an page which will allow the user to upload a csv file (for example [login to view URL]), specifying the columns to be analyzed (with a text box indicating column number(s)), and then the page will output the word frequencies for the text. That is the basic idea. The additional requirements are: There should be a text file on the server which specifies a list of words which will not be counted. (these are words like 'the', 'and', 'so', etc -these are referred to as stopwords). I will provide that list but it should be editable later. The results will display on the page but will optionally also be downloadable as a csv file which can be named by the user. Instead of uploading the input file there should be a box where the user can paste in all the data. This should be able to handle up to 15 mb of data. The output on the page should be look nice but still be copyable by dragging the mouse pointer and copying. I need this in 2 days.