Merge pull request #94 from MargaretLangley/master

Template index view icon removed, view testing link only
Timezone on server set to London
Setting Travis to london
salient_date included in application_helper
invoicing period_first, period_last => period_between
Invoing index can now be printed
feature Invocings delete
controllers homongenized
Test for invoice/invoice_show, which shows a single invoice print to screen