Long titles are displayed incorrectly

[ASmirnov-HORIS]

Look at the following simple example:

from lets_plot import *
LetsPlot.setup_html()

ggplot() + geom_rect(xmin=0, xmax=1, ymin=0, ymax=1) + \
    ggtitle('A B C D E F G H I J K L M N O P Q R S T U V W X Y Z'
            'a b c d e f g h i j k l m n o p q r s t u v w x y z')

The problem here is not only that there is not enough space for a long title, but that the title is shifted from the center.

Even with not very long titles we face a similar situation. For example, when we put a few small plots into GGBunch().

Screen from my notebook:

[alshan]

As a workaround let's align the title to the left instead of center. @OLarionova-HORIS could you take a look?

[OLarionova-HORIS]

PR: #293

[alshan]

@OLarionova-HORIS Aligning to the left of the overall plot area in not looking good:

Let's align to the left of 'geom' area inside plot. See:
http://www.cookbook-r.com/Graphs/Titles_(ggplot2)/

[OLarionova-HORIS]

Now the title is inside the geom area of the plot.
Commit: 43c4c40
Result of these changes: