Experimental yardage and weight

[alenia]

Passes lint and tests run

Things in this PR:

• /experimental now points to Experimental project rather than a legacy project name
• Add in numeric input in order to input a number that is not necessarily an integer
• Experimental page now shows ColorSequenceInfo (this was an existing feature just used in the diffusion scarf)
• Experimental page now shows how many stitches are displayed, how many color sequences are displayed
• Experimental page now lets you change between row alternating technique (I should update the dropdown to better match the pages I have already)
• There are some extra forms that let you put in your yarn yardage and see how many rows you're going to be able to get
• There's some double checker math

[alenia]

Broke this into #114 and #115, closing now.