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Created with Raphaël 2.2.018Nov171521Oct20111013Sep13Jun12431May17165224Apr232221191817161412119229Mar28272625242120191514131285228Feb2726252423201918171615227Jan26252423222120151412987527Dec24141312Removed old references to static jquery/codemirror2 filesParentheses for logarithms are now added using OP_PARENS instead of the old hacky wayMakefile cleanupApplied pep8Fixed unit tests broken due to rebase on stable branchUpdated TODO list.Significantly improved the parser.Added item to TODO list.The use of brackets is now equal to that of parentheses.Multiplication sign is not omitted anymore for multiplication of equal identifiersUpgraded testrunner to latest versionUpgraded graph_drawing to latest versionCorrected mixed up definite/indefinite integral referencesUpdated TODO listLowered precedences of expansion and exponent extensionExtending exponents is now limited to 1 < exponent < 4Updated commentFixed some negation issues in integral rulesCorrected typoImplemented correct parentheses parsing for logarithmsImplemented correct parentheses parsing for simple functions'make test' now uses testrunner from externals directoryBackend can now be killed using keyboard interrupt without errorRemoved old jquery target from make rulesRemoved unused submodule 'codemirror2'jQuery is now included as a static file instead of a submoduleAdded testrunner as a submodule (getting sick of import errors)Add missed rewrite possibility to TODO list (remove common factors in division)Fix computing derivative of negated exponential expressionsAdded some items to TODO listCode cleanupDisplay proper status indication after validation for each input lineMake sure that 'xx' is not displayed as a cross.Display error in GUI when something goes wrongAdd error message CSSFixed previously added rule for all negation cases.Added new rule for eliminating fractions from fractions.Added 'assertEvaluates' method for unit testing.Made combine_groups a high-priority rule.All derivative rules now keep using the same derivative operator al the way through the calclation.