Aggragations/Filter - fix for es 1.2.0 when no sub aggregations
fixxed link to "Coding Guidlines"

the old one links to the "Create new page"-Form
Merge pull request #621 from OskarStark/patch-1

fixxed link to "Coding Guidlines"
Merge pull request #619 from krzaczek/fix-aggs-filter

Aggragations/Filter - fix for es1.2 when no sub aggregations
Add missing pull request id to changes.txt