Overload assertThat: varargs is an implicit allOf

[alb-i986]

assertThat(url, startsWith("/foo"),
    containsString("/bar"),
    endsWith("baz"));

This change makes allOf implicit when asserting that a subject matches multiple matchers.

[alb-i986]

Travis build failed due to known issue on travis:

:test*** buffer overflow detected ***: /usr/lib/jvm/java-7-openjdk-amd64/bin/java terminated