#46 Retain ordering, view style and limit

[SebCorbin]

Two enhancements in this PR:

• the 'show', 'order_by', 'order_dir', 'view_style' params are retained so when you click on the "Requests" menu item, you keep these (they won't be reset when "Clear all filters" is clicked as they are not filters)
• a invisible submit button was added to filter form so that when you set a value and press enter, the form is submitted

I will open a cleanup issue, as I find the filters form heavily relying on JavaScript, and it should not be IMHO.

[codecov[bot]]

Codecov Report

Merging #614 (e88eeac) into master (4934ffe) will increase coverage by 1.61%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #614      +/-   ##
==========================================
+ Coverage   84.63%   86.25%   +1.61%     
==========================================
  Files          52       52              
  Lines        2076     2080       +4     
==========================================
+ Hits         1757     1794      +37     
+ Misses        319      286      -33     

Impacted Files	Coverage Δ
silk/views/requests.py	98.85% <100.00%> (+6.07%)	:arrow_up:
silk/request_filters.py	83.01% <0.00%> (+17.61%)	:arrow_up:

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