Updating outdated maps

Two maps included in package was slightly outdated. I have took into consideration, that in Poland Raid there was added 'AllowBots: False' directives for known reasons.

blitzkrieg changes:
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() added some resource mines in order to improve battle dynamic

poland raid changes: <screenshot below>
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1(!) corrected bridge repair issue from south
2 added north passage for top-right player (now every player has 2 passages)
3 more space for bot-right player (balancing)
4 less space for bot player (balancing)
5 wider passage at left-bot (facilitate moving-through for bigger groups of units)
6a/b/c added oil rigs (making mid islands more interesting)

![poland-raid-v5b-changes](https://cloud.githubusercontent.com/assets/6244620/4294959/e8b6f0d0-3de4-11e4-876f-993ac6fab1c8.png)

minor rules: slighty reduced dig time for oil mines as bonus becouse there are only 3 of them located on map in remarkable areas
slighty increased main factory reveal range to match map layout

dynamic preview changes gif
![poland-raid-changes](https://cloud.githubusercontent.com/assets/6244620/4294958/e8ac907c-3de4-11e4-9d2c-dfbd50bb3148.gif)