Generated snapshots from TravisCI for build 4069 on 2019-05-10-00:47:59

clients/horizonclient: support dynamic effects (stellar#1217)

* update effects in protocols/horizon

* update client interface

* update tests

* update changelogs

* fix typo

Horizon 0.17.6 CHANGELOG (stellar#1207)

horizonclient, txnbuild: dev docs (stellar#1199)

* basic dev site docs for new Go SDK

* flesh out package summaries

Fix /accounts/{id}/transactions error

horizon-v0.17.4 CHANGELOG (stellar#1005)

Check if multiple filters are set (stellar#995)

This commit fixes multiple issues with parameter handling in actions.
The main problem was connected to `base.GetString` method that gets
values from the URLParams, form or query string (in this order). It was
possible that extra GET parameter changed the internal query. For
example:

```
/ledgers/100/effects?account_id=GBRPYHIL2CI3FNQ4BXLFMNDLFJUNPU2HY3ZMFSHONUCEOASW7QC7OX2H
```

doesn't return effects for ledger 100 but for a given account ID because
if `account_id` is set the rest of the parameters are ignored
(`switch`). Obviously, this is not how the actions should be used but
for extra security this should be fixed.

To solve this issue:

* We count applied filters, if it's larger than 1 we return
`400 Bad Request` response.
* We ensure that `tx_id` parameter is only checked in URL params.
Additionally, we ensure that transaction hash is valid (if passed).
* We ensure that `include_failed` parameter is only checked in GET
params.

Offers schema 9 (stellar#972)

Updates offer table queries to use new Core DB schema 9
(stellar/stellar-core#1957). It also fixes SignersByAddress to support
NULL values (close stellar#967).

Horizon 0.17.3

Merge branch 'master' of github.com:stellar/go