Gregtech blocks fixes
renamed SOLARPANEL_mV.png to SOLARPANEL_MV.png to match jar asset name
added missing BOILER_FRONT_ACTIVE.png.mcmeta and BOILER_LAVA_FRONT_ACTIVE.png.mcmeta
that where causing default texture use on item versions
```java
[18:50:32] [Client thread/ERROR]: Unable to parse metadata from gregtech:textures/blocks/iconsets/BOILER_LAVA_FRONT_ACTIVE.png
[18:50:32] [Client thread/ERROR]: Unable to parse metadata from gregtech:textures/blocks/iconsets/BOILER_LAVA_FRONT_ACTIVE.png
        java.lang.RuntimeException: broken aspect ratio and not an animation
        at net.minecraft.client.renderer.texture.TextureMap.func_110571_b(TextureMap.java:169) [bpz.class:?]
        at net.minecraft.client.renderer.texture.TextureMap.func_110551_a(TextureMap.java:90) [bpz.class:?]
        at net.minecraft.client.renderer.texture.TextureManager.func_110579_a(SourceFile:72) [bqf.class:?]
        at net.minecraft.client.renderer.texture.TextureManager.func_110549_a(SourceFile:136) [bqf.class:?]
        at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110544_b(SourceFile:104) [brg.class:?]
        at net.minecraft.client.resources.SimpleReloadableResourceManager.func_110541_a(SourceFile:92) [brg.class:?]
        at net.minecraft.client.Minecraft.func_110436_a(Minecraft.java:598) [bao.class:?]
        at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:303) [FMLClientHandler.class:?]
        at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:541) [bao.class:?]
        at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:867) [bao.class:?]
        at net.minecraft.client.main.Main.main(SourceFile:148) [Main.class:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_67]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_67]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_67]
        at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_67]
        at net.minecraft.launchwrapper.Launch.launch(Launch.java:134) [launchwrapper-1.9.jar:?]
        at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_67]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_67]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_67]
        at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_67]
        at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:286) [NewLaunch.jar:?]
        at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:376) [NewLaunch.jar:?]
        at org.multimc.EntryPoint.listen(EntryPoint.java:165) [NewLaunch.jar:?]
        at org.multimc.EntryPoint.main(EntryPoint.java:54) [NewLaunch.jar:?]
```