Added brand new (and still experimental) checks for CWEs 415 and 416 together with a new interprocedural data-flow analysis engine written in Rust. Add `-partial=Memory` as command line flag to try out the new checks.

* Added feature to compiler test cases with more than one compiler. Added clang as first examples. Fixed test cases to work with gcc

* Added acceptance tests for clang x64, adjusted Travis scripts (now
runs also unittests), install_cross_compilers installs also clang.

* Skips test for cwe415, which is broken on clang + Ubuntu 16.04

* Added feature to compiler test cases with more than one compiler. Added clang as first examples. Fixed test cases to work with gcc

* Added acceptance tests for clang x64, adjusted Travis scripts (now
runs also unittests), install_cross_compilers installs also clang.

* Skips test for cwe415, which is broken on clang + Ubuntu 16.04

* Added change to CHANGES.md

* Fixed test issue: test for json output was pre-compiler suffix.

* Initial commit of cwe_checker emulation feature using bap primus under the hood.

* Fixed some Core issues with Maps and Hashtbls

* Moved plugins to their own folders as expected by BAP.

* Added .merlin since everybody likes merlin

* Further improvements in the build process

* Commented cwe_checker_emulation plugin

* cwe_checker_emulation detects double frees with the help of Primus.

* Refactoring of cwe_checker_emulation, extracted incident reporting to
module Incident_reporter.

* Added test cases for cwe125, cwe416, and modified cwe415.

* Now reporting use-after-free correctly

* Adjusted README

* Adjusted CHANGES.md.

* Added spaces to content codacy.

* Adjusted build process for emulation plugin

* fixed emulation recipe

* Reports out-out-bounds read/writes, events are not reported multiple times now.

* Adds tests for cwe-415 and cwe-416. Arritifical examples for cwe-125 and cwe-787

* Travis aware emulation tests.

* Fixed acceptance tests.

This builds cwe_checker and runs the test suite on Travis CI.