Update dependency org.apache.commons:commons-collections4 to v4.1

[dev-mend-for-github-com]

This PR contains the following updates:

Package	Type	Update	Change
org.apache.commons:commons-collections4 (source)	compile	minor	4.0 -> 4.1

By merging this PR, the issue #14 will be automatically resolved and closed:

Severity	CVSS Score	CVE	Reachability
Critical	9.8	CVE-2015-4852	Unreachable
Critical	9.8	CVE-2015-7501	Unreachable
High	7.3	CVE-2015-6420	Unreachable

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