Legendentry kwarg for BarChart and Scatter

[johannes-fischer]

Similar to #177, the legendentry keyword seems to be not working for BarChart and Scatter as well:

julia> Plots.BarChart([1,2,3],rand(3), legendentry="My Plot") |> tikzCode |> print
\begin{axis}[
  ybar = 0pt,
  bar width = 18pt,
  xtick = data,
  symbolic x coords = {1, 2, 3},
  ymin = {0}
]

\addplot+ coordinates {
  (1, 0.5346054483580505)
  (2, 0.8031940282685136)
  (3, 0.7360737650114937)
};

\end{axis}

For scatter there is the following example in the docs that uses legendentry, but it also seems to be broken in the notebook:

julia> x = 1:10; y = 2x
julia> z = ["a", "a", "a", "b", "b", "b", "b", "c", "c", "c"]
julia> sc = "a={mark=square,blue}, b={mark=triangle,red}, c={mark=o,black}"
julia> Plots.Scatter(x, y, z, scatterClasses=sc, legendentry=["A", "B", "C"]) |> tikzCode |> print
\begin{axis}

\addplot+[
  scatter,
  scatter src = explicit symbolic,
  only marks = {true},
  scatter/classes = {a={mark=square,blue}, b={mark=triangle,red}, c={mark=o,black}}
] coordinates {
  (1, 2) [a]
  (2, 4) [a]
  (3, 6) [a]
  (4, 8) [b]
  (5, 10) [b]
  (6, 12) [b]
  (7, 14) [b]
  (8, 16) [c]
  (9, 18) [c]
  (10, 20) [c]
};

\end{axis}

[mykelk]

Thanks for filing this! Are you interested in contributing a PR? Otherwise, I can take a look next week.

[johannes-fischer]

Yeah, I'll take a look at it some time in the next days.