Issue #958: Travis CI should enforce clang-format standards (#1026)

* Issue #958: Travis CI should enfore clang-format standards

This patch adds clang format support to the travis bots.

* Update path

* Roll back to version 8 since 9 is in test

* Cleanup clang

* Revert "Delete JSONCPP_DEPRECATED, use [[deprecated]] instead. (#978)" (#1029)

This reverts commit b27c83f691.

.clang-format

@@ -1,47 +1,4 @@
----
-# BasedOnStyle:  LLVM
-AccessModifierOffset: -2
-ConstructorInitializerIndentWidth: 4
-AlignEscapedNewlinesLeft: false
-AlignTrailingComments: true
-AllowAllParametersOfDeclarationOnNextLine: true
-AllowShortIfStatementsOnASingleLine: false
-AllowShortLoopsOnASingleLine: false
-AlwaysBreakTemplateDeclarations: false
-AlwaysBreakBeforeMultilineStrings: false
-BreakBeforeBinaryOperators: false
-BreakBeforeTernaryOperators: true
-BreakConstructorInitializersBeforeComma: false
-BinPackParameters: false
-ColumnLimit:     80
-ConstructorInitializerAllOnOneLineOrOnePerLine: false
-DerivePointerBinding: false
-ExperimentalAutoDetectBinPacking: false
-IndentCaseLabels: false
-MaxEmptyLinesToKeep: 1
-NamespaceIndentation: None
-ObjCSpaceBeforeProtocolList: true
-PenaltyBreakBeforeFirstCallParameter: 19
-PenaltyBreakComment: 60
-PenaltyBreakString: 1000
-PenaltyBreakFirstLessLess: 120
-PenaltyExcessCharacter: 1000000
-PenaltyReturnTypeOnItsOwnLine: 60
-PointerBindsToType: true
-SpacesBeforeTrailingComments: 1
-Cpp11BracedListStyle: true
-Standard:        Cpp11
-IndentWidth:     2
-TabWidth:        8
-UseTab:          Never
-BreakBeforeBraces: Attach
-IndentFunctionDeclarationAfterType: false
-SpacesInParentheses: false
-SpacesInAngles:  false
-SpaceInEmptyParentheses: false
-SpacesInCStyleCastParentheses: false
-SpaceAfterControlStatementKeyword: true
-SpaceBeforeAssignmentOperators: true
-ContinuationIndentWidth: 4
-...
+BasedOnStyle:  LLVM
+DerivePointerAlignment: false
+PointerAlignment: Left