Progpow review (ethereum#2893)

* clear more TBDs and merge Andrea's 0.9.4 spec

* fix broken links

* fix another broken link

* fix yet another broken link

* hope for the last broken link

* force bot

* please be the last broken links

* broken test vector label

* another broken link and test vector label

* all links now work in browser

* ?

* ??

* ready for review

EIPS/eip-1057.md

@@ -629,7 +629,7 @@ Trinity    | Python     | Ready | Developing
 
 ### Exchanges
 
-|          | Support    | 0.9.4 | 0.9.4
+|          | Support    | 0.9.3 | 0.9.4
 ---        | ---        | ---   | ---
 Biki       | Yes        | Ready |
 Bilaxi     | Yes        | Ready |
@@ -650,7 +650,7 @@ Nobi       | Yes        | Ready |
 
 ### Pools
 
-|             | Support | 0.9.4 | 0.9.4
+|             | Support | 0.9.3 | 0.9.4
 ---           | ---     | ---   | ---
 2Miners       | Yes     | Ready |
 antpool       | Yes     | Ready |