Update external_urls

updated to the new SGD urls 
resolves #3167
add sequence ontology site urls 3161
change display of various widgets in Feature page #3161
modified Overview and Association widget
added Evidence widget
modify and use shared History widget
fix sequence tag2link mistakenly markup Ace class transcription_factor #3161
Merge branch 'staging' into 245-seq-feature
Merge branch '245-seq-feature' into staging
include associations and location widgets in default widget of Feature #3161
add associated gene field #3161
vertical-align:middle for field-content and field title in highlight box
Merge branch 'staging' into 245-seq-feature
Merge branch '245-seq-feature' into staging
test case for associations of sequence feature #3161
more test cases for sequence feature #3161
Merge branch 'staging' into 245-seq-feature
Merge branch '245-seq-feature' into staging
include evidence in Feature page #3161
improve history table #3161
- handle any kind of action
- optional remark and evidence for remark
fix error on history_feature due to ->Sequence #3161
fixes https://github.com/WormBase/website/issues/3154
add DNA_text #3161