Better doc and exceptions for fixed CompMatrices (#89)

Merge pull request #84 from DevFactory/release/general-code-improvements-fix-2

Merge pull request #82 from DevFactory/release/members-should-be-in-order-fix-1

Merge pull request #81 from DevFactory/release/private-methods-should-be-static-fix-1

squid:S2325 private methods that don't access instance data should be static

squid:S1213 The members of an interface declaration or class should appear in a pre-defined order

squid:HiddenFieldCheck Local variables should not shadow class fields

Merge pull request #86 from DevFactory/release/printf-style-format-should-not-lead-to-unexpected-behaviour-fix-1

Merge pull request #83 from DevFactory/release/general-code-improvements-fix-1

Merge pull request #79 from DevFactory/release/array-designators-should-be-type-fix-1

squid:S2275 Printf-style format strings should not lead to unexpected behavior at runtime

squid:S1165 Exception classes should be immutable

squid:S1197 Array designators [] should be on the type, not the variable

Merge pull request #78 from randyp/master

upgrade to junit4