add examples to STM32L100C-DISCO board#154

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mattwinns wants to merge 8 commits intolibopencm3:masterfrom

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Commits on Mar 28, 2017

copied miniblink example to port to STM32L100C-DISCO board
Matt Winns
committed
Modified the linker script in Makefile
Matt Winns
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Modified the gpio_setup() and the example uses
Matt Winns
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Modified README
Matt Winns
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Added the modified usart-semihosting example
Matt Winns
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Added the modified usart example
Matt Winns
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Added the modified button-irq-printf example
Matt Winns
committed

Commits on Mar 30, 2017

Added the modified button-irq-printf-lowpower example
Matt Winns
committed