Better logic, access to more reactive elements

New Features

• eventReactive() now parsed to return a function (#55)
• output$plot <- renderPlot(plot(x)) transformed to output$plot <- (plot(x)) (#45)
• reactiveValues() now converted to list() (#29)

Bug fixes

• Multi-line x <- reactive({\n...\n...\n}) statements weren't evaluating inside runApp() or shinyApp() (#24)
  dummy_input removed from objects returned (#50)
• Don't add empty input list unless dummy list in code (#31)
• Rmd evaluated with or without spaces (eval=F(ALSE) or eval = F(ALSE)) (#26)

Other

• Logic for extracting server code uses call names instead of indexing (#52, 54)
• Underlying code parses expressions instead of strings (#41)
• Reorganize code (renamed files/functions) (#36 #25)