New layout for market page

[svk31]

I've made an attempt at revamping the market layout slightly. Some comments:

• I wanted to make the left div fixed position so it doesn't scroll with the rest of the page but it causes issues when there are many open orders
• I've made ui-grid headers black and bold but slightly smaller, this is a global change but I prefer it like that, the light grey was often hard to see -The "Sell orders" table should ideally be sorted the other way, meaning it should increase from the bottom so that it nicely matches the buy orders table. I'm not sure how to do this with ui-grid..

Please check it out and let me know what you think

[svk31]

I messed up the merge somehow and ended up just making commits instead..