Fix EZP-23683: session is always started for legacy_mode SiteAccess
Added redirect uris to the WT content form

Passes on the current URI as the redirection URI for the website toolbar forms. This makes sure that redirection is done to the previous URI.
Merge pull request #1099 from joaoinacio/legacymode_session

Fix EZP-23683: session is always started for legacy_mode SiteAccess
Fix EZP-23690: HttpCache: LocalPurgeClient uses deprecated X-Group-Location-Id

> https://jira.ez.no/browse/EZP-23690

`LocalPurgeClient` was forgotten in refactoring.
We shouldn't use `PURGE` method and `X-Group-Location-Id`.
EZP-23513: implement Expanding converter
EZP-23513: implement EmbedLinking converter
EZP-23513: remove CustomTags converter
EZP-23513: update Link converter to handle linked embeds
EZP-23513: update Embed converter for extraction of embed's link data
EZP-23513: simplify embedding added in #1059
EZP-23513: simplify core transformation stylesheet
EZP-23513: improve main converter tests
EZP-23513: update service configuration
EZP-23513: update compilation pass
EZP-23513: pass converted link parameters to Legacy  Stack
Merge pull request #1087 from ezsystems/fix-EZP-23513-xmltext-paragraphs

Fix EZP-23513: embed rendering (XmlText)
Merge pull request #1102 from ezsystems/EZP-23478-website_toolbar_redirection

Added redirect uris to the WT content form
[Travis] bump Elasticsearch to 1.4.1
Merge pull request #1105 from ezsystems/bump-es-1.4.1

[Travis] bump Elasticsearch to 1.4.1
Fix EZP-23487: file may have already been removed