Increase timeout in pipelining test (#174)
In CouchDB's CI the small_pipeline test intermittently fails with
something like:
```
in function ibrowse_tests:'-small_pipeline/0-fun-5-'/1 (test/ibrowse_tests.erl, line 150)
{line,150},
{expression,"Counts"},
{expected,"\n\n\n\n\n\n\n\n\n\n"},
{value,"\n\n\n\n\n\n\n\n\t\n"}]}
```
Increasing the timeout a bit seems to help in local tests.diff --git a/test/ibrowse_tests.erl b/test/ibrowse_tests.erl
index 594b8ed..5693f79 100644
--- a/test/ibrowse_tests.erl
+++ b/test/ibrowse_tests.erl
@@ -15,7 +15,7 @@
-define(BASE_URL, "http://localhost:" ++ integer_to_list(?SERVER_PORT)).
-define(SHORT_TIMEOUT_MS, 5000).
-define(LONG_TIMEOUT_MS, 30000).
--define(PAUSE_FOR_CONNECTIONS_MS, 2000).
+-define(PAUSE_FOR_CONNECTIONS_MS, 4000).
%%-compile(export_all).
