Remove icc testing, it seems to be no longer functional.

.travis.yml

@@ -25,28 +25,6 @@ matrix:
     - os: linux
       env: TOOLSET=gcc COMPILER=g++ CXXSTD=03,11
 
-    - os: linux
-      env: TOOLSET=intel COMPILER=icpc CXXSTD=03,11 TEST_INTEL=1
-      before_install:
-        - wget -q  'https://raw.githubusercontent.com/nemequ/icc-travis/master/install-icc.sh'
-        - bash ./install-icc.sh
-      after_script:
-        - '[[ ! -z "${INTEL_INSTALL_PATH}" ]] && uninstall_intel_software'
-
-    - os: linux
-      env: TOOLSET=intel COMPILER=icpc CXXSTD=11,14 TEST_INTEL=1 EXTRA_FLAGS=-gcc-name=g++-6
-      before_install:
-        - wget -q  'https://raw.githubusercontent.com/nemequ/icc-travis/master/install-icc.sh'
-        - bash ./install-icc.sh
-      after_script:
-        - '[[ ! -z "${INTEL_INSTALL_PATH}" ]] && uninstall_intel_software'
-      addons:
-        apt:
-          packages:
-            - g++-6
-          sources:
-            - ubuntu-toolchain-r-test
-
     - os: linux
       compiler: g++-4.4
       env: TOOLSET=gcc COMPILER=g++-4.4 CXXSTD=98,0x