Travis CI improvements:

[mellery451]

• define custom docker image for travis-linux builds
• add basic macos and windows builds (currently allowed to fail)
• improve build and shell scripts as required for the CI envs

Fixes #2527

[ripplelabs-jenkins]

Jenkins Build Summary

Built from this commit

Built at 20190731 - 20:52:35

Test Results

Build Type	Log	Result	Status
msvc.Debug	logfile	1178 cases, 0 failed, t: 574s	PASS ✅
msvc.Debug, NINJA_BUILD=true	logfile	1178 cases, 0 failed, t: 606s	PASS ✅
msvc.Debug -Dunity=OFF	logfile	1177 cases, 0 failed, t: 1109s	PASS ✅
msvc.Release	logfile	1178 cases, 0 failed, t: 408s	PASS ✅
gcc.Release -Dassert=ON, MANUAL_TESTS=true	logfile	915 cases, 0 failed, t: 5m1s	PASS ✅
gcc.Debug -Dcoverage=ON, TARGET=coverage_report, SKIP_TESTS=true	logfile	1178 cases, 0 failed, t: 16m54s	PASS ✅
docs, TARGET=docs	logfile	1 cases, 0 failed, t: 0m1s	PASS ✅
clang.Debug	logfile	1178 cases, 0 failed, t: 2m56s	PASS ✅
clang.Debug -Dunity=OFF	logfile	1177 cases, 0 failed, t: 11m10s	PASS ✅
gcc.Debug	logfile	1178 cases, 0 failed, t: 2m57s	PASS ✅
gcc.Debug -Dunity=OFF	logfile	1177 cases, 0 failed, t: 11m15s	PASS ✅
clang.Release -Dassert=ON	logfile	1178 cases, 0 failed, t: 5m8s	PASS ✅
gcc.Release -Dassert=ON	logfile	1178 cases, 0 failed, t: 4m58s	PASS ✅
gcc.Debug -Dstatic=OFF	logfile	1178 cases, 0 failed, t: 2m57s	PASS ✅
gcc.Debug -Dstatic=OFF -DBUILD_SHARED_LIBS=ON	logfile	1178 cases, 0 failed, t: 2m56s	PASS ✅
gcc.Debug, NINJA_BUILD=true	logfile	1178 cases, 0 failed, t: 2m50s	PASS ✅
clang.Debug -Dunity=OFF -Dsan=address, PARALLEL_TESTS=false, DEBUGGER=false	logfile	1177 cases, 0 failed, t: 14m13s	PASS ✅
clang.Debug -Dunity=OFF -Dsan=undefined, PARALLEL_TESTS=false	logfile	1177 cases, 0 failed, t: 16m50s [BAD EXIT]	FAIL 🔴

[codecov-io]

Codecov Report

Merging #2976 into develop will decrease coverage by 0.1%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2976      +/-   ##
===========================================
- Coverage    69.46%   69.36%   -0.11%     
===========================================
  Files          709      709              
  Lines        56453    56891     +438     
===========================================
+ Hits         39215    39462     +247     
- Misses       17238    17429     +191

Impacted Files	Coverage Δ
src/ripple/consensus/ConsensusParms.h	66.66% <0%> (-33.34%)	⬇️
src/ripple/protocol/impl/Indexes.cpp	86.55% <0%> (-4.71%)	⬇️
src/ripple/app/tx/impl/CancelOffer.cpp	83.33% <0%> (-2.39%)	⬇️
src/ripple/app/tx/impl/CreateTicket.cpp	93.87% <0%> (-1.96%)	⬇️
src/ripple/app/tx/impl/Payment.cpp	84.05% <0%> (-1.86%)	⬇️
src/ripple/app/ledger/LedgerHistory.cpp	50.56% <0%> (-1.77%)	⬇️
src/ripple/app/tx/impl/Change.cpp	80.37% <0%> (-1.54%)	⬇️
src/ripple/consensus/DisputedTx.h	95.94% <0%> (-1.32%)	⬇️
src/ripple/rpc/handlers/RipplePathFind.cpp	44.44% <0%> (-1.27%)	⬇️
src/ripple/net/impl/RPCSub.cpp	37.33% <0%> (-1.03%)	⬇️
... and 105 more

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[mellery451]

FWIW, current results of these builds are at https://travis-ci.org/mellery451/rippled