Issue #195 - update Travis to Trusty due to gcc/clang strtod() bug

.travis.yml

 language: cpp
 
-sudo: false
+dist: trusty
+sudo: required
 
 # from http://stackoverflow.com/a/32127147/266378
 matrix:
@@ -33,7 +34,7 @@ matrix:
       compiler: clang
       addons:
         apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.6']
+          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-3.6']
           packages: ['clang-3.6', 'valgrind']
       env: COMPILER=clang++-3.6
 
@@ -41,7 +42,7 @@ matrix:
       compiler: clang
       addons:
         apt:
-          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.7']
+          sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-3.7']
           packages: ['clang-3.7', 'valgrind']
       env: COMPILER=clang++-3.7
      

test/unit.cpp

@@ -11572,12 +11572,8 @@ TEST_CASE("regression tests")
         j = json::parse("0.999999999999999944488848768742172978818416595458984374");
         CHECK(j.get<double>() == 0.99999999999999989);
 
-        // Test fails under GCC/clang due to strtod() error (may originate in libstdc++
-        // but seems to have been fixed in the most current versions - just not on Travis)
-#if !defined(__clang__) && !defined(__GNUC__) && !defined(__GNUG__)
         j = json::parse("1.00000000000000011102230246251565404236316680908203126");
         CHECK(j.get<double>() == 1.00000000000000022);
-#endif
 
         j = json::parse("7205759403792793199999e-5");
         CHECK(j.get<double>() == 72057594037927928.0);